This idea was originally brought up when raid arenas were first introduced, but I think the game has advanced enough that it is worth revisiting the possibility of adding a new raid chest tier above 3000 trophies. I see 3 major reasons why this addition makes sense.
1.) Logical consistency: The current tiers mark every 600 cup increase up to 2400. I understand why SG did not continue this formula to 3000 when raid tiers were first created because players rarely broke 2800-2900 cups at the time. However, that has changed slowly over time and now. . .
2.) The highest players on the leaderboard are often over 3000 cups and sometimes as high as 3200-3250. This is a very difficult feat, especially as more and more emblems appear on top-tier defenses. There should be some reward for climbing that high up on the ladder besides bragging rights, especially when they are 800 points above the threshold for diamond.
3.) Most full 5* defenses leave players above 2400 cups, creating no incentive to climb further while raiding. In fact it creates a disincentive to some extent, since players have an easier time filling their hero chest starting from 2400 cups than 2600-2800. This means that many players don’t even bother raiding without their chest up since there is no reward for gaining trophies.
I believe that adding a new raid tier at 3000 trophies would revitalize the raiding scene in diamond by creating an incentive for players to climb in trophies. It also makes logical sense because the current tiers are spaced every 600 trophies, and players regularly surpass 3000. I anticipate comments about increasing the loot for top players, but think the pros outweigh the cons by increasing the activity and competitiveness in diamond tier.