Why would they invest so much money in a technology to satisfy so few?
Because it's a cheap way to bulk up their ultrafast coverage / properties passed stats. All they have to do is stick a 24-port G.fast pod on a PCP, and suddenly 300+ properties are supposedly ultrafast-enabled - even if nobody uses it.
At 30 June 2018
(end of BT Q1) they only had about 4,000 connected properties on G.fast, but there were 1.1 million where it was "available".
As the OP has found, even properties where it is nominally available may find it doesn't work when they try to connect.
EDIT: Here are later figures
to end of December 2018, showing G.Fast coverage of 1.71m properties, but take-up of just 15K.
Clearly there aren't many people with a solid 80/20 FTTC who have the desire to trade it for a flaky G.fast.
Edited by candlerb (Tue 12-Mar-19 18:24:36)