I'm not sure about this. Consider Virgin Media, who own and operate their own network... the support, for practical purposes is far worse than many ISPs who use TTB/BTw who then use Openreach.
I'm sure there are many competent engineers at Virgin but if you can't actually talk to one as a residential customer, it doesn't matter how many layers there are.
Your are quite right, I should have qualified that somewhat and said only when dealing with smaller ISPs. In many respects when dealing with big companies like Virgin, you are dealing with a reseller just using the same name, in Virgin's case they are selling connectivity from a different Virgin operation that is quite a bit removed from the sales and billing side. Same for BT, when you buy BT Broadband, they are reselling BT Wholesale offerings and BT Broadband is just sales and billing.
If for example you are with Cerberus and have an issue, the network engineers might be sat in the same office. I remember issues with Cerberus and their network engineer was emailing me directly not many minutes later after raising an issue.
Edited by E300 (Fri 25-Mar-22 15:23:53)