Re: REMOVE ARENA TRASH MODE!!!
I like Arenas, I play it from time to time and queues are not long, so I really don't see any reason for removal. You can't prove this mode is dead because you don't have access to the numbers. Also, even if the mode would be dead, the option would still remain. Choice will stay there until the game is dead and buried.
As for the challenges, they have to cover different modes, they are thought out in such a way so that you can grind for events and for the Battle Pass to the max without much effort even when playing only one mode exclusively. Nobody is forced in any way. If you actually want to complete all challenges but don't want to put up the work, that's completely your problem.