All balance updates are massive and like I said in the hit the biggest thing I like about the Queen change is that it is finally going to change up the meta game in TvZ, the 4 queen build is slightly less effective vs a delayed 2rax. The overlord change is my favorite, finally we can actually scout!

Just been checking it out in game and Im in love with the OL change I can get two overlords into position on some maps now and the queen easily shut down the hellions

the observer buff would mess up the pvp / pvt timings a lot. in sense of timings and robo production.

the overlord change is mind blowing. to give you a wow analogy to understand what that is.
imagine you travel without a mount and blizzard decides thats to slow and makes you 300% faster.you are gonna see sooo much more in the early game is ridiculous compared to what zergs used to see.

and the queen change is just…
the queen used to hit ground units as a melee unit and the attack animation would interrupt if you would get out of range.
now the queen is a range unit that attacks with projectile like a stalker, hydra or a marauder etc.
and is guaranteed to attack when you get in range
now that alone is huge but when you add +2range its gonna mess up a lot.
marines,hellions,reaper are not able to kite a queen anymore.she would also have a lot to say about bunker”2rax” and cannon rushes. also she is not gonna die so easy now because she stays behind the roaches.

also worth mentioning is that hellion expand is standard in tvz. now 4hellions are not gonna have the same effect. which is gonna mess up again some timings if you still wanna do what you used to do. and a banshee follow up is actually pretty common.