It is because “you have no choice”.
Using Brig as example.
Tracer mains have “no choice”.
No matter how good you are, (unless Smurfing)
You cant play Tracer without soft throwing.
As Tracer’s teammates, you have no choice.
90% of the game outcome is decided on “is Tracer going to switch”.
You have almost no control over “is Tracer going to switch”
During Mercy meta "play Mercy or lose"
The feeling of “dont play hero A or lose”,
“u either play A or lose”,
“there is nothing you can do to change the outcome”
is the MAIN reason people hate meta.