The older you get the more you grow to realise that you have never seen it all and new surprises happen every day. I wonder what the passenger in 3K who presumably hadn’t asked for any food thought when presented with the OP’s food mid-Atlantic! I can see how some people would just go with it rather than make a fuss but it does seem strange.

OP - will you write in? This is one of those situations where, once the meal has been eaten, if there isn’t a spare, it is very difficult to fix. You also mention seat power issues and seat issues.

I think you need to decide whether you want to pursue it further (and if you do, what you would like to achieve). 6,500 Avios for no main meal in international first class (and the service cock up that led to it - yes mistakes happen but it should be put right) feels low to me, so I’d be tempted to write a concise letter to BA and see what they say. I suspect they will politely tell you they’re sorry to hear that you didn’t receive your first choice of meal and they understand how disappointing this must have been but having reviewed the case thoroughly they are unable to offer you anything more, but if you don’t ask you don’t get*.

*except in the case of Mr/s 3K who didn’t ask for pork 6 hours into the flight but got it anyway.