As dzug says,you are a security risk.
When Elsie & I travelled by plane frist (back in the 1960's) most Air Terminals were plentifully furnished with seats.
As terrorism increased (up to and after 9/11) the seating all but vanished overnight.
The more seating units there are the more hiding places for explosives,and the more difficult it is for Police to find said explosives.
Not good oldies like me,I have to hurry through to airside hoping (usually in vain) for more seating.Although we are now in out 80's,we have taken to booking airport VIP lounges just to ensure a good seat etc before boarding.
As dzug says,it would be nice to have more seating airside too, but once you are there you are a bit of a captive auduence.