You'd think that, but once I replaced my €5 AliExpress connector cable by a proper one, suddenly I haven't had any issues with projectors any more.
Likewise, if you use an underpowered laptop, or one for which Ubuntu doesn't have proper drivers, you're going to have a hard time using Zoom.
I'm not saying that you'll never have issues (which I'm sure holds for MacOS as well), or even that you might not have slightly more issues than on MacOS (see your last paragraph), but things are definitely not as bad as comments online would have you believe, because many of those can be ascribed to issues like I mentioned above.
Likewise, if you use an underpowered laptop, or one for which Ubuntu doesn't have proper drivers, you're going to have a hard time using Zoom.
I'm not saying that you'll never have issues (which I'm sure holds for MacOS as well), or even that you might not have slightly more issues than on MacOS (see your last paragraph), but things are definitely not as bad as comments online would have you believe, because many of those can be ascribed to issues like I mentioned above.