Shit, I'd play as Hanuman. Give me a spear and a bow and I'd monke all day.
...monk monke
Turtle monk is also interesting, being a unique Ninja Turtle

Let DnD Players return to Monke.
More seriously, I am a bit surprised 5e (or 4e that I remember) hasn't pushed forward a monkey race (or even a monkey themed monk subclass) as part of character options? On the "furry" end of things we got a new UA with Rabbitfolk I think, and already in the ruleset we got multiple scaled and feathered type characters, and even Shifter or Simic Hybrid for those who love werewolves or other animals and wanted those features, but we never had a direct Monkey player character as far as I know? Then again maybe they are trying to avoid something derogatory or something along those lines cause some people might twist something like that very poorly (I'd rather not go far in this line of thought...)?
Yeah, it´s forgivable. I hope see a mod of monkey nevertheless. Werewolf can be a good background for characters. If it became too powerful, than you can make negative background to balance.
If you choose positive background like werewolf or vampire spawn, then you must choose one negative background that will give you some disadvantages.
They can just copy paste what 5e genasi get. They are a good race to play but I wouldn't say OP.
The genasi of the book is balanced, but I as talking about the mod on Nexus. Did you watched the video?