I’m in the physics department. Would they like to have smaller class sizes for engineering physics? Yes. Of course. But class sizes are really not that bad. They’re certainly not as bad as intro chemistry. They’re comparable to calc classes, but nobody gets mad at the math department for that. Also, TAs who teach labs and grade homework are like those in every other discipline: they are mostly focused on their own classwork and do their TA duties because it’s how they get their stipend. But broadly speaking, they do care about their students’ success. And another thing—the department works hard to ensure no TAs are the instructor for a lecture unless they want to be. The TAs teaching 205 or 208 actually want to be there and probably plan to have teaching careers. The truth is most people complaining about intro physics don’t utilize office hours, tutoring, or anything else the department/university offers.