Also many enemies have entirely different stats and abilities.
Enemies having different stats and abilities is mostly fine to me because most DMs add or change things on monsters to suit the encounter and change the experience, most monsters in the MM are meant to be bases I feel and it is up to the DM to use them as is or change things. And in this case Larian is being our DM. Though a lot of other things I would 100 percent want to be closer to base DnD, especially the mage hand issue cause this is gimping familiars hard and gimping summoning in general.