I have read at least two different articles on flushing the trans. Both seem pretty complicated to me, but I am just not really inclined to do a lot of mechanical stuff with my vehicles. Basic fluid and filter changes are about as much as I care to tackle. I have no problems with changing the oil and filter & doing the fuel filters.
My opinion, FWIW, is that it would be beneficial to do a drain and refill and remote filter change every 10K miles. I plan to have the dealer do my first flush at 30K then get on a schedule of drain and fill every 10K miles.