Been following a Openreach engineer on tiktok, feel sorry for the guy as the work he is doing to help people who lose sync speed or have instability is a losing battle against ancient copper, and he is working in an area where Openreach have decided copper is the future (no FTTP investment). Lots of interesting stuff, some of it tech related on how faults are diagnosed etc., and also some of it internal Openreach politics. Interesting to learn as an example a pair swap is really just a "temp clear", and the actual proper fix done at a later date.
I mirror what dee jay said, the g.fast deployment is basically a maxed out copper deployment, using massive frequencies, and all the techs like SRA, g.inp, adaptive banding and so on. The DLM now days is far better than when it was first introduced on ADSL, so whatever you have lost will probably be recovered within a week.