I think I've been busy.
Kind of surprised they only moved the Berserker's trait into the attack and didn't change any other stats and cultist lost their advantage. Guess they still matched the targets close enough not to change.
Not sure about magical weapons not getting around the resistances with the Fire Elemental, seems like an unnecessary nerf to martial characters. Although I suppose a lot of spells do acid, cold or fire. Then we get the gray ooze, which no longer damages non magical weapons. Guess they're really doubling down on not needing magic items.
Incubus and Succubus are now just different forms of the same creature? Interesting, I guess it makes sense since they're fiends. It also gives us a reason to have two different entries now instead of them just being mirror images with a different sex. I can now see an Incubus being a real pain if it just focuses on hit-and-run tactics to stop short rests, especially since it can also enter dreams to stop a long rest.
Knight gets 2 attacks whether melee or ranged but other than that unchanged, while ogre is exactly the same. But ogres already were pretty nasty for their CR.
I think overall simplification is a good idea, even for things like the green dragon where it just now has rend. Yes, we don't distinguish between a poisonous bite and the claws, but does it really matter unless reach matters? It's certainly easier to run when you don't have to worry about which body part it's attacking with even if it does reduce flavor a bit.
I suspect the bigger changes we'll see like what we have with the adult green dragon where there's more design space and they needed beefing up. Seems like they're relatively happy with low level monsters.