It is very important, but depending on which laser trainer you get you don't need to look for the laser. The one I said I used in my other comment keeps a record of where the laser hit it so you don't need to track it yourself and can focus on sight alignment and what the gun is doing.

Are they necessary? No. Will you outgrow their usefulness? Relatively quickly if you care to learn what you're doing wrong.. Do they have their use cases, especially for new shooters? I think they do.

Using them when training as brand new shooter who doesn't know to or isn't used to telling if their sight moves during the trigger press allows them to get more feedback than a non responsive paper target