See, here's where we totally disagree. As a DM for my group I've always felt constrained by the v3.5 system for creating monsters. Making them bend to the requirements of PCs is just too limiting. Want that Orc to wield two battle-axes, well he's gotta have Dexterity value of X and Two-Weapon Fighting feat AND Oversized Two-Weapon Fighting feat and that means he'll need to be Y level and blah-blah-blah. No thanks. I'll just write down "2-battle axe attack" on his character sheet and not bother with the minutia of rules-jargon for a monster that will most likely die in the 2-3 rounds of combat he's featured in.
Personally, that's never been a problem for me. I would still write down "2 battle axe attack" and worry about the details later if they were required. Knowing that a PC legal path was technically possible, and something that the player could emulate if they chose to, would be more than enough support to carry a 2-3 round beast. That's what I like about the 3.x system of monster creation; I don't feel like I have to treat every single detail of a monster as if they are a PC, but they are similar enough that when a PC wants to copy what they see a monster doing, there is a way for it to happen. With what I saw from 4E, that was not really possible, and it's good that with 5E, they seem to have found a decent compromise.