I believe the issue was that the builder was 'late to the party' (ie: had not noticed us about the new-builds they were developing), then took it upon themselves to install copper services within their builds.
When OR have then been asked to attend site at the 11th hour to provide service, copper feeds were initially agreed. It then transpires this was refused (maybe from a higher level ??), and FTTP was the only thing left on the table.
Regardless of the Copper/FTTP decisions, I think it's incredibly sloppy for the house-builder to have overlooked what is now being classed in political circles, as a utility.
It is offered FREE to install for the house-builders, so it's not a cost issue. Plus, FTTP speeds will be a massive selling point for them too, I'm guessing ??
Al-in-all, I think the buck stops with them, in this instance.