Does that help in this case though? I think the worry is that a rogue Obsidian plugin does bad stuff with your Obsidian vault, not just do stuff to the rest of the computer. But that vault/those notes live in the same sandbox as the (rogue) 3rd party plugin, which doesn't help with that, they really need to be isolated away from the notes themselves.

For real security, operation should only be allowed after 24h of cooldown.