I have discussed on previous posts how I feel about PvP Arena at its current format . People keep on using their best p2w monsters on ladder , which is totally fine , BUT it gets boring and repetitive and it's like playing the same mirror matches all the time. AI needs improvement for the defense team (Nox for instance keeps on killing himself). Moreover, the rewards are not compelling, being bronze is better for the gems than gold 1 which has silver chests.
So, what if there was introduced a new format for the arena? While keeping the already existing format and calling it " classic " where you can use all your monsters or whatever team you want there would also be another one where you can use monsters according to that season's restrictions. In that way , you can have one ladder which is for the "older players" who have the best of the best teams and one which is "noob" friendly since restricting monsters will make people be more creative rather than using those cookie cut builds.