I wonder what it would have been like if SAO had some death scenes animated.
It's probably because no one really knows how "Having your brain microwaves" would look, from the outside.
Though, the books never said your brain was microwaved, either. Just that there's a powerful electromagnet.
I recall in the web-novel, it was states that having it removed would leave you in a brain-dead state, so it's likely in canon, the electromagnet just destroy's erases your brain's information.
I wonder how that would effect your body...