In Photoshop, when I open brushes, I can see a preview of all my brushes. In Illustrator, if I want to use any brushes, I have to first load a library based on the name of the library. I have dozens of libraries, and often they all have similar-sounding names. Not only is it frustrating to open the same couple of libraries EVERY TIME I open Illustrator, but I have tons of brushes I probably never use because I don't want to individually load 50 different libraries just so I can find a brush that looks like what I need.

Also can we open all brushes in one panel/tab please? I don't need to have six different panels/tabs open to use multiple brushes.

I feel like I need to emphasize that I have tons of brushes, and I'm at the point where I needed to draw a quick liquid-looking smear. It was faster to go to a royalty-free site and download a vector of a liquid-looking smear than it was to find the right brush in my library. For something that would have taken me about ten seconds to draw if I could find the brush quickly.