Obsidian is using electron, so the source is already somewhat available anyway. I understand them not making it open source, and risking someone forking it and harming their business. But considering the situation, I would think making it at least source available on a popular forge, where people can make issues and open merge-requests, might be a beneficial thing.

There are a bunch of small problems people encounter here and there, which usually will never be solved by the company. Giving the community a route to improve their tool, would be good.