I agree this would be more realistic but, I have seen so many people say that line ‘it’s been exclusive for X amount of years, that should have been the reward you still have the achievement (like that means anything).
It’s a slippery slope, I just believe there are other middle ground solutions then bringing rewards they claimed were ‘time-limited’ back.
Recolors being the most enticing for example:
I think a lot of people would be happy with that.