Probably not worth getting your knickers in a knot about. It’s a process that involves the humble human. Errors will happen and such is life.

As as an aside I set a new personal best the other week. From walking off (an EK at T3) 380, hand luggage only, I was boarding my train from platform 15 at Victoria only 47 minutes later (I timed it). Literally all the planets aligned, no line at the passport gates, trains arriving as I stepped onto the platform for the Heathrow Express and the Circle Line, and the Circle Line actually rattled along efficiently! Anyone beat that?!