Cosmetics and mounts are already not timegated anymore so that’s not even part of the discussion people bring up still. Regardless, those + achievements and titles aren’t limited time, so why would a person that’s in the 99% care if the 1% got it early when they can get it any time they want?
The timegate problem has more/everything to do with arbitrarily preventing players from just playing the event to it’s fullest and restricting 1 reward that is only meant to last a few months.