I have no problem with phase pistols, lasers, phasers, lasers that act like phasers.... it's just a TV show. I not like I'm not saying that every advancement we've discovered since TOS can't be in Star Trek because they never mentioned it... we didn't have much to argue about before TNG. I just consider the pilot episodes to be 23rd century produced entertainments and somebody didn't hire a good technical advisor, so that fixes my continuity problems.
So far I haven't seen too much that really changes canon, depending on how you interpret on-screen dialogue.
"Retreat?! Hell, we just got here!", annonymous American Marine, WWI
"Gravity is a harsh mistress....", The Tick