FTTC ultimately has been a failure, a total waste of time. That was when Openreach was being run into the ground, now that lot are gone and we have decent regulation again due to Openreach/Ofcom credit, we're doing it right.
Just my opinion...
Most people would have spent most of the last decade on oversubscribed ADSL without FTTC.
The Openreach FTTP rollout is only going as quick and efficient as it is because the FTTC rollout was deliberately built with future FTTP in mind. The network is basically built to the Agg Node already.
At it's time FTTC was a quick win and the right choice for a few years.
They stuck to that for too many years though.
Not doing FTTP to new builds much earlier was a big failing.
G.Farce was a failure.
Being dragged to a late large scale FTTP rollout by Virgin's project lightning and aggressive Alt-Net FTTP investment/deployment was a big failure.