Last winter, my wife and the plumber-in-laws were struggling to remove a drain from our well-aged stainless kitchen sink. They spent two hours trying to get the nut off with no success. I suggested that they go out to the big-box store and buy a new sink, but they were stubborn.
TL;DR I took a 4" hole saw while they were out in the garage looking for other tools to try, stuck the drill bit into the center of the strainer hole, and, well, let's just say that they could take the stuck drain nut and a nice round piece of the sink bottom out to the vice where it was easier to work on it.
The sink was at least 20 years old and slumlord grade, not anything special.....