Uhm... huh? Just because the beam is presented as moving toward its target instead of instantaneous, the phaser has no advantage over today's handgun?As presented in Trek, Phaser Beams really hold no practical advantages to real life guns of today. I've always hated that.
How about the fact that a phaser can stun someone effectively using non-lethal force so that killing can be avoided? Or that a phaser can be used as a tool for cutting through objects or generating a heat source? Or that a phaser can be set to vaporize and instantaneously remove tons of debris that is trapping someone? Or that a phaser can be set to a high enough power setting to incapacitate or kill creatures powerful enough to be unfazed by a bullet? Or that a phaser can be set to a wide beam and hit large numbers of targets at once? Or, heck, that a phaser can be used to sweep through a room and detect changelings?
Seems to me phasers have many advantages over today's guns.