The number one feature of modern microwaves that I appreciate is the humidity sensor. Figure out if your microwave has one, and it opens up a whole world of better solutions.

Know the popcorn button? Ever wondered why every popcorn manufacturer tells you not to use it, or, if you don't make a habit of taking orders from a paper bag, why it works on some microwaves, but fails miserably on others, either burning the popcorn to a crisp or, more often, leaving half the kernels unpopped? Humidity sensor. In microwaves with a humidity sensor, the microwave runs until the humidity stops rising, (which means the kernels stopped popping) then stops (well, actually mine sets ~30 second timer, then stops). This produces perfect popcorn every time. Doesn't matter the brand of popcorn, it just works.

Unfortunately, because this feature was so great, it got imitated on every microwave, regardless of whether it has a humidity sensor or not. On those microwaves, it just sets a flat timer, which cannot adapt to variations in popcorn. Since popcorn manufacturers have no idea which camp your microwave falls into, and can't assume you have any idea either, they just tell people to neglect a fantastic feature.