Yes, John, and that is why there is GURPS.
Let's look at it from another perspective. What if someone decided that in SR5, they'd get rid of the current system, and go to a class-based system? Sure, you could still make your rigger, or samurai, or technomancer, or mage, or... But would it really be Shadowrun? Any system that has been around for decades will have a few things that just ARE that system. Class is one of those things in D&D. Another (used to be) the Vancian magic system, and you had better believe that caused a MASSIVE drekstorm when it was revealed that they were getting rid of it in 4e.