I disagree, in my opinion the use of a laptop is a very good thing. However, it probably wouldn't be for anyone that is interested in the most basic adjustments you can get by with.
The KX tuner is head and heels more advanced than the YZ tuner, and that is before you even consider the data logging mode it offers. For anyone that has any experience using a Power Commander or similar devices on their street bikes, they would probably consider the YZ tuner very rudimentary. Which may not be a bad thing, depending on your perspective.
I am hoping that before I make my purchase that someone will be selling a more advanced tuning system for the YZ. I am sure most of the top teams are not using the basic factory tuner.