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I'm sure you're aware it exists, but the Vim plugin for IntelliJ is actually good enough, imho. Might be worth a try.

When a language has only one practical choice of IDE, that's a red-flag to me.

Why is that?

Exactly. LSP for Kotlin in VSCode unfortunately had far inferior experience compared to IntelliJ native support.

You're right. I should give it another try.