I think it depends on the language server - metals for Scala, jdtls for Java, pyright for python,jstls for Javascript/Typescript and omnisharp-roslyn for c# are

I think it depends on the language server - metals for Scala, jdtls for Java, pyright for python,jstls for Javascript/Typescript and omnisharp-roslyn for c# are all pretty good. Cold startup time for lsp servers in bigger languages (scala/java/c#) are akin to IntelliJ/Rider import times. I don't have all the same refactorings as intellij, but then I don't have to pay a license to edit c# code, either. Most people that I watch use IntelliJ don't use it to its fullest extent. I will open it to pair with other IntelliJ users. But I'm faster in emacs. I've also used it professionally for almost twenty years. To get me to switch an ide would have to be as extensible, keyboard centric, cheap (both free and in terms of memory usage), and portable (across platforms and languages) as emacs has been. That's a tall order.