"2)How about turn it around - forget FTTH, invest in 5G and great coverage with reasonable data plans and then you can run all homes off 5G wirelessly rather than needing individual wired connections and you can get the same speeds wherever you are in the country."
Why would I go from a rock solid wireline service *with no data cap* to a wishy washy wireless service with variable speeds/latency and caps?
For 5G to live up to the hype and perform adequately as a wireless local loop with plenty of capacity, you need a lot of small cells - e.g. on lampposts or telegraph poles. The best way to backhaul those small cells is fibre. So you put up the cells and get the fibre into the ground.
Congratulations, you've built fibre almost to the home and added tons of additional complexity for no real reason. Why not just do FTTH instead?
BT aren't wrong about this one - 5G has a rather tenuous business case (going from IoT devices which need little bandwidth all the way to gigabits to individual handsets - why?). Far better to keep improving 4G coverage while the case for 5G builds (or falls flat).
Between this and their desire to finally get on the FTTP bandwagon, I'm actually rather impressed