I interacted with many professors in OS research and other adjacent systems fields when touring grad schools and I heard or saw that some were extremely toxic or intense compared to other fields I saw. With OS at least, big tech companies seem to hold a lot of influence over research directions (eg. so much of it is specifically for AI datacenters, or for one company's AI datacenter problems), and I asked OS professors about this and got disheartened replies that there was nothing they could do because of the incentives in the field. I was quite disillusioned. I know that AI being a hot new topic makes leaves more stones unturned and might lead to more publishability, but it's still depressing.