How about a world without teachers, electricians, plumbers, carpenters etc?
Your model is one where only the product matters and experience and system setup, means nothing. Sure you can do everything yourself with enough reading and practice however your results may vary.
For the record most of the time an experienced dealer can walk into a room and can improve a system sometime just by making a few simple and inexpensive changes.
Yes there are bad dealers but there are many superb dealers!