I know I'm going to sound incredibly insensitive, but I don't understand why people would complain about the seats not being bigger. For the vast majority of people, their size/weight is a result of personal choices. Those choices come with consequences, of which not being able to comfortably ride Banshee is one. I have absolutely no issues with that.
I know several on this forum have stated they attempted to lose weight to ride (and were successful) and I applaud them for that. They took the initiative to better themselves so that they could fully enjoy the park. Many others need to do the same.