I don't know there's any benefit with ProChannel because PC plugins are accessible by scrolling if too many to fit the window vertically.
This new featur Plugin Recyling has to do with normal VST plugins.
At one time every plugin opened its own window so if you had 10 plugins you'd eventuall have a screen full of open plugins. Now you can set a default behaviour where a newly opened plugin will take the window of the one already open resulting in there only being one plugin window being open at any one time.
The setting can be over ridden per fx or in prferences as a default behaviour. It's similar in function to the Windows Explorer setting where each click can open up a new window or use the existing window thus keeping your desktop clean.