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All completely valid counter-arguments. In my defence my perspective is very narrow towards only self-hostable open source tools. Like the types you might wanna self-host in a company anywhere between 10 and 200 employees. I don't have any knowledge of, say, open source libraries and how they operate, and the same applies to all of the exceptions you've listed except LibreOffice.

To be even more specific: I was responsible for maintaining three OpenProject installations in three completely different places. One is a small non-profit that couldn't realistically afford anything else, one is a cheap and very poorly-managed for-profit company, and one is a much larger non-profit that ultimately ended up paying for some "better" proprietary solution. The only things I could think of that those three places have in common are: I worked there, and OpenProject was used to some extent, even if only briefly. And it was never because of me! Other people have made that decision, but it was my responsibility to maintain it.

That's why I'm so opinionated in this thread.