Clearly they’ve been told to restore the BW after the pretty much impassable state they left it in, and this is the only method they know.
The only thing I can think for the Devil’s Gallop thing is that someone took the horsey reference seriously, and decided the rock drops by the wall were a bit too treacherous for pony club. The method of repair is questionable, given the amount of water that rolls down the thing every winter (which is why it was washed out to bedrock there anyway).
I don’t think it’s particularly ‘entitled’ to think losing one excellent descent permanently, and another for a couple of years is a bit of a shame. The thread does serve to warn people not to bother pedalling up to either.
The Parkamoor thing is slightly mysterious, as it was perfectly passable by 4×4 to gain access to the cottage at Low Parkamoor after the previous round of infilling.