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Functional programmers also say "how can I go back to mutable state and OOP". The fact is people get stuff done in many different ways and paradigms. You found what works for you and that's good, stick to it. Others found theirs.

You can annotate types in Python and Typescript.

Before that large companies like Google got around it by annotating in the comments. It may be an inferior solution but huge codebases serving hundreds of millions of users have worked this way.

Huge code bases serving hundreds of millions have been written in wasm, so...? Bad argument

There was no argument, the commenter was just asking “how”.

Modern Java is not what people may remember. It has var keyword for local type inference, lambdas, etc.