You may not think it works together, but go try having 14 different open source packages to replicate the same functionality and then try tell me that Microsoft's stack doesn't work together. I've tried it, it's fucking painful.

Just because it doesn't do a specific function that you want doesn't mean it doesn't work together.

Being able to do things like send a chat message(Teams) to your co-worker linking to a task(Planner), that has an attached file(SharePoint), where you can then both edit the file at the same time(Office/SharePoint) before jumping into a voice call(Teams) to discuss that same file, then being able to create a meeting(Outlook) to follow-up on the finished product while remaining in a single application(Teams) the entire time is what I mean by working together.

You simply can't do that with any other stack. You can get one or two parts of that, but never anything like the whole.

Disagree with me all you want, but Microsoft knows how to integrate. That's why companies consistently choose them. The only reason other countries are moving away from Microsoft has to do with political reasons, which to be fair is completely valid. However, the product is still better, and anyone who says differently is lying. The only thing that even comes close is Google's offerings, and that isn't any better because it's also American.

Even Nextcloud is pretty bad, every single thing is an additional paid add-on.