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.