I don't really want to go through the laundry list of issues I have because none are critical, just the software is very rough around the edges on Linux. It just feels less than flushed out, and I've had a million little problems and bugs that I've reported and never heard anything back (as a paying user!).
Because my personal gripes with Zoom are mostly about its quality as a software product, which I find to be abysmal for my use cases.