Hi
I expect ECI will get no more business from BT in future, g.inp is an established dsl technology that has been around for almost a decade and they cannot even implement it in their firmware properly.
It's odd it was working and seemed to get through testing the first time and was deployed, and it was working great for me. The basics are there, but obviously there seems to be some issue or compatibility problem again.
BT are to blame though, they should never deploy equipment lacking functionality they know they will enable or want to enable during that equipment lifespan. As you say G.INP is nothing new, there should be no reason why it wasn't on and working from the very first VDSL connection. The same situation applies to vectoring, which is never likely to see wide deployment now, and if you are on an ECI cabinet, forget it.
Regards
Phil