I believe the point of trying to make this site mobile-friendly has gone beyond what's really necessary. Users shouldn't have to choose whether or not to collapse threads, pick the "old format," or anything else that's complicated.
This isn't necessarily a criticism, but an observation. Whether or not I "have control" over how pages and threads are viewed, I still have to excercise that "control" each and every time that I wish to comment or read a new response/comment.
The site was fine way, way back. And, I understand the need to create a mobile-friendly access, but the current format is simply too complicated, redundant, and unnecessary. Why should users have to go through so many steps just to see what's been posted, recently?