One of the things I suspect they're trying to do with some of the healing buffs is making healing no longer be a trap. As-is, you should almost never spend an action healing (unless it's to bring back someone who is downed), because that action is much more efficiently used damaging enemies and causing them to not hit in the first place. This buff helps make what people think clerics should do - heal - into something that is more useful.
The Spirit Guardians change was probably just to make the spell work like people assumed it worked anyway.

I know it creates wacky edge cases but honestly if the monk wants to give up their turn to grapple the cleric and move them around, I'd allow it - monks get like, what, 12 attacks per turn now?

(j/k but really, it's a lot.) It's a poor use of their action most of the time. If they want to pretend to be a cleric for moment, more power to them!
Sidebar: hello again Mistwell! Nice to see you still hang out here - I've been out for a bit.