When I was at William and Mary, there was a debate in the student government about whether it should exist at all. One dormitory elected representatives for the specific purpose of introducing a resolution to disband the student government. It was introduced and debated throughout the year without resolution. By springtime, I believe the issue dominated the discussion at every meeting, with a lot of anger. At the time, it seemed to be the long-haired radicals who were trying to upend a (not really) revered institution, as the shorter-haired and dressier elected officials of that august institution fought back against the barbarian hordes.
The radicals did have a killer argument at the end of term. If the student government could go that many months without doing anything else, it was obviously useless. They were right, but the student government was not disbanded, merely starting again the next autumn with a partial change of characters. It was supposed to teach us about government, or something. I now see that it did, or should have, though not in the manner intended.
I read today about a student government wanting to ban cafeteria trays for environmental reasons. So they are still around, and therefore must occasionally succeed at things like this. It's a perfect spot for virtue-signalling, come to think of it. I don't recall what resolutions were passed and actions taken in my day. I do recall there being a lot of talk about voices being heard! but maybe that was somebody else. I'm guessing they don't provide any measurable benefit, and likely create mischief.
Update: So we have established that a common function is setting up student fees and free concerts. That sounds familiar - they also did free films when I was in school.