Use case or problem
Currently MacOS does not support spellcheck for all languages so there is no system wide spell check on MacOS at all. I’m working with Ukrainian language (but problem same for many other).
In addition MacOS native spellcheck works badly when document have mixed languages.
On other hand working with Obsidian on Windows/Linux does not have those problems. It uses built in chrome (electron) spell check that works both with more languages (including Ukrainian) and mixed languages on the fly.
Proposed solution
Add option to user built-in in electron chrome spell check
Current workaround (optional)
No workaround