I think it’s more that the popcorn maker can’t guarantee that you won’t burn their popcorn, or wind up with half a bag of un-popped kernels, by using your microwave’s internal settings. The warning is, “we take no responsibility for the outcome, if you press that button”.
I would recommend setting it to something like 6–8 minutes instead so that if something prevents you from being there to take it out when done (bathroom emergency, etc.) you don’t potentially burn your home down
I use the popcorn button anyway and never have any problems. I think the popcorn makers just want to spite the microwave makers.
I think it’s more that the popcorn maker can’t guarantee that you won’t burn their popcorn, or wind up with half a bag of un-popped kernels, by using your microwave’s internal settings. The warning is, “we take no responsibility for the outcome, if you press that button”.
Some microwaves have a humidity sensor that determines if the popcorn is done and it works well.
Some microwaves have a preset cooking schedule for microwave popcorn and it doesn’t work for all types.
Personally if I’m making microwave popcorn, I just set it to 99:99 and wait for the popping to stop.
I would recommend setting it to something like 6–8 minutes instead so that if something prevents you from being there to take it out when done (bathroom emergency, etc.) you don’t potentially burn your home down