Missiles using the same set of standards from, say 1976 would be fine. They would be much smaller, shorter, would actually look like missiles rather than ridiculous rods, and would zing across the room with some real power!
Then our lovely American children began to kill themselves with their toys and boom, launching missiles for action figures/toys was forever f***ed.
I was there, oh yes, I was there. I was 9 years old. I remember my Dad taking one of my favorite toys, a BSG Cylon Raider, and sending it away in the mail because of some "recall" crap. What came back in the mail was an abomination. It was a Cylon Raider that had been raped and mutilated. The lovely little red missiles that I used to blast stacks of dixie cups and whatnot with were now SUPER-GLUED IN!
Over the years, the unfortunate results of this form of natural selection continued to plague the toy industry; Micronauts now came with all missiles glued in place, Kenner SW Boba Fett's backpack missile got the same treatment, G1 American TFs got missile launchers with either weak or totally removed springs, and finally, the missiles themselves were made longer and longer (so as not to be swallowed by children whose litigious parents can't read an "ages * to *" and "Choking Hazard" warnings) until they just look ridiculous jutting four inches out of a gun barrel.
It's been a long irritating ride. So I believe that yes, the lack of missiles in Prime toys is definitely a step in the right direction. It's best if they don't bother with "launching missiles!" in the US anymore.