I kind of see what you mean.
http://prolineracing.com/1-10-buggy-performance-parts
For example, parts are divided into bodies, tires, wheels, and performance parts. It's a lot more customizable. A lot more granular.
I mean there's different shocks, springs. I can even pick my own body.
Whereas with my Tsauro-X, there might be replacement parts, but it can really only fit that car.
I'll also wait for your next response, whenever you have time. Because I'm sure I'll have more questions.