I wrote 5+ years ago what would be needed to support significant whitespace in Emacs Scala 3 syntax support in "other" editors - #2 by fommil , a plan for anybody who wants to pick this up. That would automatically give all of these IDE features that you’re referring to. tree-sitter is not really taking off; major modern languages usually have an experimental alternative (and inferior) tree-sitter mode in emacs.
The only way you’ll get to “There should be” in all editors is to put Scala Center resources on implementing these things. It is not clear to me who you expect to do the work here. The tooling community is too small to pick it up and is anyway split across the Scala / Scala 3 divide for various reasons (many outside of our control).
Maybe when you say “IDEs“ you mean only IntelliJ and vscode. Which is also fine, but I then wonder who Scala 3 is intended for, if not all Scala developers.