We are agreed that for most people 10ms vs 22ms makes no practical difference. On the other hand for gamers this could be critical and if it can change at any time without warning (including maybe 60 seconds totally disconnected) I would hesitate to call it stable without adding a caveat.
That doesn't sound normal or representative of my experiences - and I have a lot of circuits using them - many of which run for many weeks (FTTC) or months (FTTP) at a time with no disruption at all, no PPP loss whatsoever. If you're having issues being entirely disconnected I suggest you get some support.
if you have a wander round the internet there are a good few IDNet customers who are presumably on Zen back haul who have regular drop-outs and re-connections. You seem to be either lucky or on another backhaul. At one stage I was seeing a drop and re-connect about once every three or four days. Now it is only happening about once a month but IDNet do not want to know and deny that there is any problem. Why do you assume that other people posting here are less capable than you and have not already done the sensible things when there is a problem?
I do have a lot of circuits and I do know which backhaul they're on.
If you're seeing disconnections "once a month" there's really nothing to see and no real issue to be discussed, and especially if those disconnections were in the early hours when all manner of maintenance by everyone in the chain from Openreach up to Zen would be likely.
If you're seeing several disconnections a week, there is something wrong and it is worth discussing. and especially if it is during daytimes when you would not expect maintenance type work typically.
Do you have anything more specific you can share on when these issues are happening?