Aren’t some of the row 6 seats designated for disabled travelers? Doesn’t mean you can choose the seat, but you might get booted out of your seat (possibly at the last minute) if they need that seat. Some warning pops up during seat selection, I think.

Another downside of row six for some people is the bulky seat belts due to the embedded airbags. My wife doesn’t like these, especially after they deployed for no discernible reason on the ground (we were in row 7 or 8 and thought someone had fired a gun).

As for leg room.. I am 6 ft and all of PC has plenty of leg room for my needs.