Here are some pics of a job where the guy was certainly aware of all the different wiring methods; he just didn't believe in supporting them.
EMT needs to be supported every ten feet, and within three feet of every box. (358.30)
Sealtite needs to be supported every 4-1/2 ft., and within 12" of every box. (350.30)
Flex needs support every 4-1/2 ft. and within 12" of every box. (348.30)
Boxes need support. (314.23)