The reality of commercial microwave popcorn is the problem, not the "idea" of microwave popcorn, if that makes sense.
What I mean is, if you make homemade microwave popcorn with good oils and a pinch of salt it's presumably fine. But the cheap packets you buy in the store, brand-name or not, are full of crap - rancid, cheap oils, additives and preservatives of all kinds, weird artificial flavors, almost certainly a ridiculous amount of salt and sugar, and now possibly packaging that's of such poor quality it leeches PFAs. It's not the corn that's the problem.
What I mean is, if you make homemade microwave popcorn with good oils and a pinch of salt it's presumably fine. But the cheap packets you buy in the store, brand-name or not, are full of crap - rancid, cheap oils, additives and preservatives of all kinds, weird artificial flavors, almost certainly a ridiculous amount of salt and sugar, and now possibly packaging that's of such poor quality it leeches PFAs. It's not the corn that's the problem.