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Just because a browser is unsupported doesn't mean it won't work; it means they're not going out of their way to fix it if a problem does occur.

When Skype decides your browser is unsupported, it means you can't use it at all: https://pix.toile-libre.org/upload/original/1556784915.png

I think your parent comment was talking about why changing the user-agent 'fixes' it.