No 'normal' people need not pay more.
I applaud this. being of a big frame, 6'3 and 275 at my best cut weight, with guns bigger than most folks neck. I didn't have to tuck my shoulders through a 3-0 door... but I did through anything less.
The arbitrary design of airplane seating has never fit me, even without an ounce of fat.
Equally, as the article mentions, kids under two used to fly free - I would take exception to that, because my last flight with my entire family, I paid for three 'seats', some extra in luggage, and that was it. Three of us flew free. I was only charged at the time for my wife and I, and my elder son, IIRC, who would have been a late teen. His closest sibling at the time might have been eight or ten...
The exceptions have not saved you a damn dime, nor made me pay more. They have simply limited me from flying at all.