IMO, there's nothing wrong with doing water change daily. theoretically, it should be good for your fish since it gets a new supply of cleaner water. however, you still have to consider the stress that your fish will go through every water change since you will be adding new water that the fish hasn't felt yet. that's why sometimes it's better to perform water changes with longer intervals. and like what froggyfox said, if the water still is OK then there's no need to change it because you may only stress your fish in doing so.
as long as are sure that you can minimize the stress on your fish, then daily daily water changes aren't bad. in fact, i know someone who does 100% water change daily. 50% in the morning and 50% at night. and i hear it does great for his fish.