The glass partitions in the away end
The placing of the earth from the excavations
Falmer station (OK, hmm..)
The line of sight from some areas
The open corners
And probably one or two other things which I can't remember now.
I should imagine the architects have done a thorough job of calculating the space needed. I think you're probably worrying about nothing.
Of all the things I was worried about when the stadium was being built, none were founded.
Blimey, I should have been an architect...
https://planningapps.brighton-hove.gov.uk/online-applications/files/B6D200BD33381D887F762F33EA775FC1/pdf/BH2023_02872-LOCATION_PLAN-19171622.pdf
As someone famous once said...
"You can please most of the people some of the time, but you can't please some of the people most of the time. And some moaning bleeders you can never please, any of the time."
Or something like that, anyway.