system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why does a microwave have a popcorn button and the popcorn bag doesn't want me to use it?

Feuds? Elitism? Conspiracy? Bad programming?
gpt
The popcorn brand has done extensive testing, popping hundreds of sample bags in a wide variety of types of microwaves.  Then they establish a general time setting that works for that specific type.  

They have no idea how accurate your popcorn button is, but they don't want you to have shitty burnt popcorn and then blame them for it.  So they tell you to cook for ____ amount of time, and not to use the popcorn button because they have no clue how long your microwave's popcorn button might be configured for.