All I could only ask for today is just a better ide support.
I don't like vscode; even though the plugin for intellij has improved, there is still a lot to be desired
I'm a bit biased as someone who's already used to nvim, but the coc-elixir support is fantastic. Takes a bit of configuration but once you've got the language server set up it's better than any IDE.
The IDE type tooling is getting better all the time thanks to Elixir-LS. There was a 0.6 release a couple of days ago with a ton of improvements [0]. Better auto-completion triggers and Ecto completion come to mind as huge quality of life improvements.