I do wonder whether anyone here stating these things have actually sat in one. If I was to read the reviews of my old M235i GC, and my current i4, issues with rear space is stated about both of them and with special comments about the size, or height of the rear doors making it tighter to get in and out of, plus the coupe style restricting height in the rear.
Guess what, I never purchase a car thinking about rear passengers and never will. My son in law is over 6' and if he doesn’t like it in the back he can walk. I bet there aren't many owners, if any, who drive these cars with adults in the back all the time anyway.
So really footwell space is insignificant to the sum of the whole car and what is more important is how it drives, how it performs and how it looks.