to be fair to BA it's no worse than anyone else. Virgin out of LGW is even more weighted towards Y and if this is a splitting of the fleet it actually makes sense to do this on a bucket and spade base.
Most leisure flyers out of LGW won't notice the denser Y. For me the (probable) removal of the cupboard and loss of the row 1 privacy is a bigger issue.
Edit: just seen post #9. that changes things a little.