Re: Pitfalls of G.fast
"It's not a cheap alternative to real Fibre"
It's not cheap at all.
The advantage from BT's point of view is that they can charge you 250% of the cost of the terminating equipment upfront and still get to keep it. if they run fibre there's a much longer payback period.
The flipside is that most copper in the Uk is so rotten that they'll need to run new stuff anyway. At that point it makes long-term sense to run fibre, but BT is so pathologically hidebound that they'll insist on running copper anyway even if it costs several times as much to do so.