Exploring the idea of building a native code editor, what features are missing from your current tool of choice?

Really early on this but have been toying with the idea for a while now. As a designer, there are a lot of visual changes I'd love to see in a code editor for the basic front-end work I do.

This obsession literally started because VS Code or Atom doesn't let you automatically change your color theme based on device preference. I'm sure there's a plugin but that's the point, I feel like that should be built-in.

I have a lot of the basics for a V1 from my own perspective mapped out but I'd love to hear what might be useful for actual developers or even teams.

And of course, I'd opt for making this native for MacOS (If it works windows/linux too for sure) as opposed to just another electron app. Something about being native just feels right.

Any thoughts on features or why this is a terrible idea are all welcome!