I used to have a single vault. I recently created another vault for a different purpose and realized how having multiple vaults work. Obsidian is currently opening the vault I last used/closed.
I want to be able to pick a default vault, or have obsidian ask which vault I want to use when I open the app. Either is fine. Would you be interested in implementing that?
None. Since it opens the one I last closed, I open the vault manually by clicking on the vault picker icon. A very minor inconvenience.