What if you want a single language that's pretty fast while simple and maintainable?

Then you pick C# which is both faster and simpler than Go.

I like C# but simpler? I don’t believe so.

Simpler it definitely is not. Better, yes I would accept that. C# is complex though.

C# may be easier but it is not simpler than Go

didn't that language have like 150 keywords 10 years ago, it probably has 500 keywords now

Recently I stumbled upon https://crystal-lang.org/ and I love it!

It's really great fun to build stuff in Crystal, I don't have anything prod-grade yet to say how it scores there but the community seems to be happy about that too.

Crystal is slow to compile. There is a variant of Crystal that compiles a lot faster. But I forgot its name. Need to dig it up when I get back home.

I agree, the compiler is slow but I don't mind much, or better, the fact that I find building maintainable programs much easier outweights that downside massively in my case.

It's surely better than Kotlin in simplicity and maintainability. It also doesn't tie you to the JVM.