Please, intervene more decisively with bans in every format. Historic and Timeless, specifically, need more cure from you.
Ajani and Bombardment are blocking Historic and playing against Mono Green is very boring, because you have to watch indefinitely your opponent playing. My opponent's turn lasted more than 5 minutes in my last match. This kind of thing pushes the players away from Magic Arena, causing big losses to your game.
Arena formats, especially digital ones, need more attention, because of the higher number of matches compared to tabletop ones, and you have the task of creating a healthy environment.
Arena is not a simple container of cards.