Yeh, tell me about it. I'm 6ft 5 and that's not fun in any kind of seat, bus, first, whatever
It's bad enough on 1-2 hour flight, impagine 18hrs.
If you think about it, if the airline put animals (a dog or cat) in the seat, made them check-in, line-up on the airbridge etc, etc they'd be busted for crulety to animals. But hey ! it's only pax so treat em how you like !!!!