So its no secret that the dev’s approach to balance has always been “let the meta game settle” which made them very slow to make changes throughout the history of SC2. A problem this caused is that once players learned how to deal with strong strategies blizzard being late to the party shows up and makes changes that aren’t really needed cause “the meta settled”.
There has never ever been a unit/building added to the game outside of an expansion but this is what blizzard decided to do rather than force protoss players to learn how to play with sentries. They just bam fired up shield batteries and then tossed in battery overcharge with cheap void rays that become the 3rd fastest air unit in the game.
Now the game is completely thrown out of balance, it has never been more frustrating to play because all their drastic additions to protoss opened up a whole slew of cheeses and broken strategies. No one wants to play this game anymore and the ones that do are switching to protoss.
Below masters no one uses sentries anymore, it used to be an essential unit to give protoss an edge and get them into the mid to late game. Instead their new broken abilities have allowed them to get to the mid to late game with aggression while having an insane safety net.
No one wants to play this crap anymore.