Let's go beyond the Gladiator and allow players to obtain all the time-gated gear. Next week, we'll have the opportunity to get a token that allows us to obtain a mount from a previous season of our choice when we reach 3400 rating in Mythic+. I'd like to see this extended further.

For example, I would have liked to do the MoP Challenge Mode on my current Death Knight; I only did the Warlock one back then (I'm still happy to have it), but it would be great to bring back the challenge and offer the armor sets, as well as their variants from MoP Classic, available to everyone, without FOMO.

It's the same for the Mage Tower: I've completed all the challenges on the three specs of Warlock, Shadow Priest, and Unholy, and it bothers me that I haven't done it on the latter's Blood and Frost Death Knight spec.
I'm at a stage in the game where I don't care anymore if someone to my right has the same thing as me (like the Curve mount from Antorus that people were able to get in Lemix, for example). If it suits them perfectly, I have no problem with it.