Interestingly, I asked the same question on a YouTube video posted by a Virgin Media engineer named Jude 6 days ago. https://www.youtube.com/watch?v=n32DQsyfoek&lc=UgxkB...
He responded to some of my questions. I asked him why the Nexfibre isn't designed or printed on the omnibox and it only says Virgin Media. Since this can cause confusion especially for those less informed customers who do not know that they could eventually choose another ISP on the network or even know that it is full fibre. It would've also helped differentiate between Nexfibre and Coax DOCSIS 3.1, this is important as not many people even know this yet!
He claims that he is not 100% sure why this is the case but he thinks this is because Virgin Media want to save money not having to re-badge the design equipment as it will increase cost and delay the roll out.
This is the answer to my second question... judepl: In relation to your second question, if you were to join an ISP which uses the Nexfibre network, an XGSPON ONT would be installed, similar to an Openreach FTTP installation. The fibre connection terminates at the XGSPON ONT which is then connected by ethernet to the providers gateway device. If you were a Virgin Media customer beforehand and had moved to another provider on the Nexfibre network, with how we install currently this would need another engineer visit to install an XGSPON ONT, unless they make it so the customer can plug it in and set it up themselves, similar to QuickStart orders.
As for your last question, you can use your own router if you require. You can put the Hub 5X in modem mode and connect your own router via ethernet to the Hub 5X.
Thanks for watching! 
These were the answers to my questions. I watched a few of these videos and found his videos hence why I asked him those questions.
I think Hub 5X exists to save money not to have to install the ONT. They are probably passing on the buck to the ISP rather than Nexfibre taking responsibility. Unless, of-course the ISP calls Nexfibre engineer to fit one manually. But this just means multiple visits and that may incur a cost to the customer indirectly by raising the packages to compensate this loss...
Also putting in modem mode isn't something I would like because if the Hub 5X is faulty then it will make things complicated. We won't know what is causing problems whether our own router or the Hub 5X.
Also someone on YouTube reviewed the Hub 5X named Off Topic Reviews saying you can't open IPv4 websites as VM only has IPv6 support. And also DMZ wasn't working and would not open any of the ports. I'm not sure about the legitimacy of those complaints.
If this is the case, that would be a major disappointment and will repel a lot of potential customers. If the Hub 5X is problematic people are going to skip Virgin Media since I think most people don't use their own router.
Modem mode on the Hub5X has never worked properly, and to enable it you have to manually punch in the link to the page on the hub, and even then its a complex and diabolical process to get working correctly.
IF you get it working, it only works on the 1Gb ports, which again is useless for customers with 1Gb+ connections, and potentially useless with the future support of more than 1Gb.
The IPV4 website issue has never been a problem, and i ran a few low maintenance proof of concept websites through my Hub5X, you need to disable the IPV6 option on your local devices which then pulls local, and public IPV4 address. I don't think i have ever seen a IPV6 address from my 5X, ever!
Interesting information about the VM engineer and the nexfibre branding though.
Many thanks for your reply. I've only just seen your post.
I'm aware that Virgin Media does not support IPv6 and indeed it has to be turned off. However, I came across this youtube video
https://www.youtube.com/watch?v=5XuL8RdER1I
"VIRGIN Media Hub 5X modem mode how to enable (FULLY WORKING)"
The problem is this guy is saying completely the opposite. He is saying that his Modem mode is working but only when he enables IPv6. I really don't know how this is possible since Virgin Media does not support IPv6.
He is also claiming that modem mode works but only with the 10GbE port, yet that is opposite to what you're saying. He claims that the trick to making modem mode work is while rebooting the Hub 5X to then connect quickly modem mode to get it to work.
Indeed, there should not be an IPv6 address coming at all. Just like with TalkTalk I had to disable IPv6 from Windows 10 network adapter properties as it does not support it. But only turned it on when I joined BT. But I don't know why this user is saying that IPv6 is working but IPv4 does not.
While you're saying IPv4 works perfectly but with 1Gb port. There is some contradiction with what he is saying in his video compared to what you're saying.
Nevertheless, seeing that the Hub 5X only connects via the Fibre optic cable. I discovered that there's an ASUS RT-AX89X (AX6000) Dual Band 12-stream WiFi 6 Extendable Gaming Router, Dual 10G Ports that supports an SFP fibre port!
https://www.asus.com/uk/networking-iot-servers/wifi-...
I know that this router is quite expensive and probably an overkill for most users but seeing that this has a 10G SFP+ port, I am wondering whether you could simply directly plug the Virgin Media fibre cable to this router that way you avoid having to use the Hub 5X in modem mode?
If this is possible then that may be the best way of solving these problems. Unfortunately, Virgin Media Nexfibre does not come with ONT and that severely restricts the option to use other routers that do not have an SFP port. I do not know if more ISPs that eventually join the network will install an ONT but that will be the only way to resolve this restriction.
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