What problem does this address?

Currently, if you are trying to search for a block that has more than 1 word with the / command, you're unable to complete the search. For example, you can't type /site logo as the second you add a space the / command goes away. This came up in the latest FSE Outreach Program's call for testing particularly as many of the Site Editor blocks have two words in their name.

What is your proposed solution?

Enable the ability to search for multiple words when using the / command :) Some of this likely touches on this currently open issue: #22194