Aircraft above a certain size are not allowed to taxi under their own power along Echo and have to be towed. Hence the Tui 757's departing from outside the hangar always route via Bravo (Alpha became Bravo between the main apron and the intersection when the Bravo extension opened, end of 2017 IIRC). Not sure if the 787 would be permitted even under tow. Wouldn't affect 738/A319/A320/A321 as far as I am aware (i.e. 99% of commercial traffic).
Aerodrome chart here:-
http://www.ead.eurocontrol.int/eadba...2018-08-16.pdf