One little technical point 72 is not the only constant frame rate used in cinema, higher numbers (always with 24 as a factor) have been known, 96 for example. (not terribly coincidental that 120Hz and 144Hz have appeared as monitor numbers as the former counts 24, 30 and 60 Hz among its factors while the latter 24 and 48). (The sweet spot for display refresh rate would likely have 24, 25, 48, 50 and 60 as factors as then all major display rates would effectively be covered, allowing, colour issues aside everything to be displayed at its intended display rate (only an issue pre HD, as HD and post colour codes are much more uniform).
(Experiments were done many years ago showing displaying less than 46 fps causes headaches and eyestrain (a likely driver in the way projection worked)) Interestingly the nocebo effect (like the placebo but bad) likely was the cause of many of the headaches that the Hobbit was claimed to have caused (Even in those being shown 24fps showings).
Motion blur is a big part of what makes the difference, without it the differences between 24 and 48 or 30 and 60 are a lot more slight. Some things like sports (TV or games) and action games the blur can cause issues, so the higher frame-rates are useful purely visually, in drama the extra sharpness can detract. (For media where parts would benefit from each there has been suggested the use of mixed frame rates, so action is shown in HFR and other parts at 24. a projector displaying at 96Hz or 144Hz should easily deal with this provided with a suitable file).
