If these suggested “workspaces” are anything like Obsidian’s vaults, then it’s worth pointing out that most Obsidian users only use 1-2 workspaces. For the people that have two, it’s usually personal and work notes (or RPG, novel writing, etc.). Some people even go back to using one vault after discovering the need to make connections between notes of different workspaces or finding it too difficult to maintain isolated sets of notes in the same app.
-1. Tags, search, and the archive work just fine for isolating sets of notes in Bear.