Just as important, it's about exposure that's refined, polished, planned. If Tom Cruise was in a reality show, seeing him as his everyday self, instead of Ethan

Just as important, it's about exposure that's refined, polished, planned. If Tom Cruise was in a reality show, seeing him as his everyday self, instead of Ethan Hunt in a highly produced Mission Impossible movie that took Tom Cruise thousands of hours work, training, a large team, editing, SFX, engineers, VFX etc. Then he wouldn't be the same Tom Cruise in your mind.