I'd think that such an encoding would waste encoding space on stroke combinations that are not valid, and therefore not be more compact than Unicode in practice.

I think that the TRON encoding supports vector graphics in addition to all Chinese, Japanese and Korean Han/Hanja/Kanji characters as separate code points. The vector encoding is for spelling of names (family names and places) that you wouldn't find in dictionaries.

https://en.wikipedia.org/wiki/TRON_(encoding)