Comment by bryanhogan

The main problem I have with using different Vaults at the same time is that they all share the same taskbar icon. For syncing you can sync your files however you want.

I mostly use one Vault for my setup, then things like linking and search work the best: https://bryanhogan.com/blog/obsidian-vault

I wouldn't call it unsuable though? I have one separate vault for just journaling and that works well.