It's not BT per se, it's Openreach. They switched to no-engineer FTTC installs about 2 years ago, which confused the heck out of me when we moved house 18 months ago
Basically it's down to not having to send an engineer out to do the fitting, which, to be fair, is more convenient for the customer. Presumably the concept is that the kit in the cabinet/exchange and modern microfilters are good enough to support the higher speeds of FTTC nowadays.
We've certainly had no major issues with speeds, although the connection is occasionally a little flaky - I suspect that's down to being a somewhat rural community though.