I agree that "updated patch" would do more than enough to help find 4.X compatible addons.
The idea was if you like to find something working with 4.X it's not easy enough just sorting, I know you can search for 4.1 working addons but then you are forced to enter some part of the addon name -so not suited if you are looking for something unknown -if that makes sense.
Browsing is like when you are in the store, you go to the "action bar" section then look trough what they got -only that in this store you got fifty thousand different action bar addon packages ranging from old to latest, so you have no choice but go trough it all.