Laser is past the development stage-- there haven’t been any significant technological improvements in a while.
There’s also been enough time to determine that consumers with light skin and blond hair do not respond to laser well (if at all). That’s because lasers target a kind of melanin in the hair, which is the pigment that makes hair brown or black. If your hair is dirty blond, you have almost none of the melanin you need to make laser work.
Laser is a good option for some, but it’s not a good option for people with the hair color you or I have (blond or red). Any ethical laser practitioner would tell you the same thing.