I think the main use of the favs inventory tab is to prevent storage with @storeall and to prevent accidentally selling of items to the npc. I don’t think I know anyone who puts things in the fav tab to then sell it to the npc
I constantly see newer members ask why things are still selling when they put it in that tab.
I know it’s easy to just turn on the lock option, but I think it would be best if the sales lock on your inventory favorites was turned on by default.