I don't really understand the Teams hate. It's like most MS products: it basically works and has a pile of annoying bugs. Chat, video calls, and so on basically work, and it's the only video calling app I've used that's actually good at sharing presentations in a way that works with accessibility tools and even just with different resolutions (due to some tight coupling between Teams and PowerPoint that probably should be subject to some antitrust scrutiny). Most of the alternatives to Teams are bad in different ways, some are bad in the same ways. It's significantly less bad for video calling than Zoom.
Outlook is far worse than Teams in almost every way (for example: after 30 years of people reporting that it can't properly quote emails in replies, it still can't properly quote emails in replies). Word and Excel are worse in many ways.
JIRA, in contrast, is a UI that is entirely designed to torture users. Everything is at least five clicks more than it would be in a good UI flow.
I've not tried it on non-Android Linux but the Android, iOS, and macOS clients are all much better than the Windows one.
The Windows one prior to New Teams would peg my CPU at 100% quite often. The Mac one never did (even on a Mac that was five years older than the Surface).
Aside from the stupid text input box (which is common to a lot of Electron apps), the Mac version is fine. Drag and drop works in a bunch of places where it doesn't work on Windows, for example.