Meanwhile, at WoTC's HQ....
Jeremy Crawford: Love the weapon masteries!
Chris Perkins: Yeah!
JC: But I'm worried. With all the other changes, the players are going to be stronger.
CP: Yep. Pretty pretty pretty strong.
JC: We should do something. Hmmmm... maybe we should give the monsters some weapon mastery love!
CP: Woah! Mind. Blown. That would be awesome! But wait ... are you thinking what I'm thinking?
JC: That it would be fiddly for DMs?
CP: Um, actually I was thinking of ordering in some burritos, but yeah, that too. So what do we do?
JC: Great question! Players are stronger .... what can we do, Chris?
CP: Same thing we always do, Jeremy?
JC: You're right. Let's give the monsters more hit points!
CP: Brilliant!