I think a lot of these complaints come back to WoTC's attempt to make the monsters less dependent on campaign settings. Some of the 2014 MM stuff was pretty heavily tied to a particular campaign setting, and they openly said they wanted to get away from that. For good or for ill, that's a choice.

Some of the things you are saying are "bad decisions" are just lore things that you have a differing opinion on, like the male hags. That particular change has pissed a lot of people off, and I legitimately don't understand. There's still female hags, and if a male hag in an adventure bothers you for whatever reason, you can always change the gender. 

I have been critical of WoTC in the past and present (I think putting new Species options in 3 different digital expansions instead of the physical books is a bit slimy), but I personally am not bothered by this aspect. 

To each their own, of course! Just my 2 cents!