If it wasn't for watching Naruto (I don't watch anime often and just started watching Naruto a year or two ago) I wouldn't have known about different artists managing certain episodes. I surely noticed, but I never understood why until I researched it.
I have to say, I really dislike it when it cuts to low quality animation after using the real nice ones. Like where Gohan first turns Super Saiyan 2 it has the quality animation for that episode, but the next episode goes back to the lower quality one during his transformation.
It'd certainly be nice if they did a remake with modern art advances and software with only the higher quality artists, but it'd be expensive I'm sure.