It's already hard to get cosmetics in this game, waiting year and half or more for the specific themed crates to come back is INSANE.
Plus now there are already a lot of them, rotating crates more often would make more sense now than ever. I have to wait now unknown amount of time for Grim Harlequin or Celestial crates...and I just want to play my character now with the certain cosmetics that are ONLY obtainable in those 2 boxes. In half a year or so I would already lose interest.
I saw people ask for certain crates to be brought back on the forum even. If ZOS see this please bring back Grim Harlequin or Celestial crates but ideally just rotate all crates more often please. You lose nothing but people would want to get some cosmetics all the time.