Most other airlines don't operate from the hellhole that is Heathrow.
Is is the disgraceful T4 baggage system operated by BAA that is failing BA and its customers here, aided and abetted to some extent by the BA baggage handlers being rostered in a different manner prior to the move to T5 and playing silly bUggers.
The locals in LOS are angry at the lack of performance in repatriating their bags a week or so later and threatening/acting menacingly towards flight and cabin crew.
In the meantime about 10,000 bags are at LHR awaiting repatriation, some apparently from last August's security fiasco.