Not sure I can accept most of your assertions, but anyway, I left America in 2008 and IIRC there were microwaves available in every 7-11 even then?

There were't any $4 healthy bowls of anything, but there were $2 "red hot beef & bean" (& fake soy filler) burritos which hit the spot if you'd failed to find a way to eat real food...

The problem with the microwave solution, I think, is that pretty much only burritos and pasta can be packaged in a microwavable way that still tastes good? And maybe like a few kinds of vegetable side dishes.