Yeah, TeX name autocomplete or better yet free unicode description search triggered by \ is the obvious direction. (think github emoji search, like how :ship also offers :anchor: and :package:)

https://kasperpeulen.github.io/PressAndHold/Unicode/ was a novel attempt. [source: https://github.com/kasperpeulen/PressAndHold] The trick is you long-press any letter, e.g. press Shift+A and don't release => you get a popup offering 𝐴 ∀ 𝒜 𝔄 (use arrors & Enter to select) Long-pressing letters is amusingly unnatural, I have to make a conscious effor :-)

Apropos unicode notations, that demo was made for https://github.com/kasperpeulen/CoffeeTeX, a unicode AsciiMath-inspired notation.