This is an extreme overstatement. I have used Ubuntu LTS server editions for years without issues. It's widely without much issues. Sure, things could be better

This is an extreme overstatement. I have used Ubuntu LTS server editions for years without issues. It's widely without much issues. Sure, things could be better, but "completely unsuitable" is laughable. You're free to pick something else if you don't _like_ it, but that doesn't mean that it's unsuitable for server usage for a fact.