Idea for 3.0 is to disable all functionality that isn't well polished and focus on few parts first. Starting with poses.
- Adds a new experimental option "Extended Asset Browser", replacing "Asset Browser".
- Unlike the previous option, this isn't enabled by default anymore. This didn't work well in practice and caused plenty of confusion.
- "Mark as Asset" and "Clear Asset" are hidden if the option is disabled.
- Same for the category selection in the Asset Browser.
- Always show display the "Only Assets" option in the File Browser while browing inside .blend files. That way you can hide data-blocks that are not pose assets.
- The Asset Library setup UI in the Preferences is always visible now, it's needed for pose library access.