Damn straight!
As well as support for plugin thumbnails, like in Cubase and Studio One.
And the app should also automagically sort third-party plugins into categories, just like with the built-in ones, so that each user doesn't have to do all that work themselves.
Better plugin handling is pretty much my number one wish for Logic. With hundreds of third-party plugins installed by many if not most users these features would make far more of a difference than the most.