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Nothing.

Just a markedly different technology than how it’s implemented in our universe.

What does that even mean?

Nothing. Just like nothing is wrong with Java or JavaScript...

Both power a large majority of the web.

Is that good or bad?

Obviously has a vote of confidence. The companies using it are making money. Just like those using PHP and WordPress.

You can run .NET MVC on Linux/Docker/K8S nowadays natively very easily as a first-class customer.

Nothing; he's just a hater.