The only thing I really wish Blizzard would add to this is fast-tracking the secondary reputations - The Avowed, The Court of Night, etc.
While Court of Night had an average grind, The Avowed is, frankly, a slow, miserable slog I thought Blizzard had learned long ago has no enticement. Since none of the awards from the Avowed have any real efficacy at the end of the expansion, no one is “hurt” if Blizzard just offers a decent catch-up mechanism outside of the DMF buff. At the very least, having reached Exalted with Harvesters should have given us a significant buff, but also Avowed rep should drop in Nathria - especially given it was the Avowed who rebelled against Denathrius, so would have the most invested in those who dismantled Deathrius’ power base. But at this point, I would use my currency to buy rep tokens, just to get this done.
I would also change the sinstone mechanics and allow us to buy specific sin stones. This RNG thing is not fun (and I only need one to complete the set).
There are those of us who actually enjoy using end of expansion to wrap up any tidbits we didn’t have time to do in the thick of the expansion. And while it’s nice to give people who only know one lane of gameplay enticing content, please don’t forget about those of us who understand that an MMORPG is an “amusement park” of activities, and like to ride the Tea Cup just as much as the Mega-coaster, just to mix things up.