FTTP and Cable will power though intense use, fake fibre and ADSL won’t.
I also disagree with this post.
Cable is probably the most vulnerable - those networks are split into segments (with hundreds of homes) and there's not actually much capacity available. Virgin currently do not do it, but they used to limit the amounts of data you could download per day to avoid that network becoming congested. There's a very good reason why Virgin has never been too generous with those upload speeds. The Virgin forums were at one point full of examples of people experiencing long-term bouts of peak time congestion, though I've not taken a look in a while
FTTP has a similar approach, though the splits are smaller and the amount of capacity higher (Openreach's current design allows for 2.4Gbps down, 1.2Gbps up shared between up to 32 homes). It is unlikely though not impossible for FTTP to become congested, especially now that ISPs are launching gigabit services (BT has done so this morning)
FTTC, or "fake fibre" as you insist on calling it (bear in mind that Virgin started that idea), can be better. The connection between cabinet and home is what it is, but the green cabinets can have plenty of capacity linking them back to exchanges.
The core networks will be fine - as we've seen with BT publishing their numbers, showing that the normal evening peak totally outstrips anything they're seeing during the day
More to the point, the support is second to none. I'm not treated like a moron. This week, the director at my ISP helped me troubleshoot an issue with Janet's higher education network which was impacting myself and a bunch of colleagues trying to work from home by dramatically limiting the throughput to something like 50 KB/s.
I guess it depends on which ISP we're talking about. I was previously a customer of a provider that you'd probably say was in this group, but the technical "support" I received was quite frankly shocking. I also wouldn't suggest that all ISP routers are crap - some are better than you might think (and arguably better suited to people without deep technical skill)
I see netflix have stopped 4k broadcast as a temporary measure to improve bandwidth for the rest of the network.
It's at the behest of the EU -
https://edition.cnn.com/2020/03/19/tech/netflix-internet-overload-eu/index.html
As a die hard remainer/rejoiner even I think they might have overstepped on this one - it would have made far more sense to let the ISPs make that decision based on their own data.