I don't care for that explanation. The reason Roddenberry abandoned "laser" for "phaser" was because he realized it had been a mistake to use it in the first place, that actual lasers didn't work anything like what was shown, so it was a misnomer. If he himself had made more stories in the "Cage" era or before, I have no doubt that he would've changed "laser" to "phaser." Just like other things such as dilithium and the Federation have been retconned to exist earlier than they were introduced on the show. The word "laser" was only used two times in "The Cage" anyway, so it's easy enough to disregard. I think it was Grace Lee Whitney who wanted the miniskirt uniform. We see it as sexist today, but women at the time saw it as a liberating fashion statement. And I believe the techical term for that dress design was mini-culottes -- basically a briefs cut with flaps to suggest a skirt.