Literally all I want is for followers to convert core stats to their preferred type. For instance, It's really frustrating to gear out an Enchantress as a Demon Hunter. Granted, it's much easier now with the cube, as all you have to do is farm up some mats and level a Wizard to 70, then re-roll the item until it suits your needs, but even that just feels like an unnecessary time-sink. The odds of me finding the optimal gear for one are low enough as-is, (especially something like a Thunderfury with IAS and CDR...) much less getting ancient versions of them.
That said, I would LOVE if the "Cannot Die" relics weren't mandatory. It just feels so pointless have the other two options considering they just instantly pop no matter how decked out they are. I understand that they shouldn't be as powerful as players, and that they'll never be anywhere close to as powerful as their D2 counterparts, but I'd still like to have options. While we're at it though, Blizzard really needs to update the info tabs for followers to include CDR. We all know it works, so why isn't it present? Silly