Every time the GLA flight is bussed from A4 in the future you'll hear moaning from all the ex-bmi pax complaining that it was never like this in the bmi days.

Of course I've had my fair share of bmi bussing at T1 over the years (usually when a domestic is on the international pier or vice versa).

In general I'd say A4 isn't hated as much as A10 because it's only used for domestic flights, so the aircraft are smaller and there's not F or J product so people don't feel it's destroying the premium experience.