I used to be heavier than I am now, 6ft tall and Size 22.
I purchased an extra legroom seat, at extra cost (which I was happy to cover to be more comfy)... but as I also asked for an extender belt, due to my tummy being too fat to do the seatbelt up... I was asked to move as I was "not deemed 'fit' to open the door in an emergency".
So, in front of everyone, just before take off, I was asked, not so quietly, to move, and sit away from my family, and to make it worse, I was asked to swap with someone else, which meant they were separated from their family. I felt mortified...
It was a hole in the ground moment.. People turned around and were looking at me... and I spent the rest of the flight holding back the tears, and the rest of the holiday, crapping myself about the return flight.
I've lost weight now, and still get very anxious about flying.
I'm not asking for sympathy... I'm posting my experience to show the other side. I can still remember the giggles and the dirty looks from the family I had split up, unintentionally.
Something does need to be done to accommodate heavier people, I agree.. I would've loved to afford by purchase two seats for myself, but I just couldn't have afforded it.
How about offering extra width seats, away from the emergency door, and charge a premium?
My husband is 6ft, but very slim.. And even on some flights he's been on, he felt squished, width wise as well as for legroom.
I don't know what the answer is, but I wouldn't want anyone to have gone through what I went through.