Electron sits on native rendering primitives. Do you suggest that every developer who wants rich interactive text in their app should write a text rendering engine from the ground up?

I'm suggesting that instead of going with the heaviest-possible option, they first explore built-in capabilities like TextEditor (https://developer.apple.com/documentation/swiftui/texteditor) and/or the many open source projects which offer Markdown support (https://github.com/gonzalezreal/textual).