@publicvoit +1 in general. I believe your recommendation is phrased wrong, though.
Emacs and org-mode lock you in just like Markdown + Obsidian do.
It's waaaaaay less likely you'll be screwed, though, because Emacs is free software.
But that's not the same argument.
While Emacs is maintained, you can get the editor to run on your operating system. If by chance it dies off, you can tweak the source yourself, but for regular Jane and Joe that's the same as company goes bancrupt.
@ctietze 100% agree!
I did not prase it as good as you but meant the same thing.
Obsidian: for people who are not able to learn Emacs Org-mode for reasons. 👍 (we may differ on the set of valid reasons or their priority)
If you are in a position of being able to learn such a system (which is easer than most people suggest), Emacs has its advantages over Obsidian.
And: There can't be any bancruptcy of Emacs. Therefore, there is zero lock-in effect except in your brain, of course. 😉