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It's all factory assembled now.

Not the cars I have.

Most of the Tamiya kits available you are still able to build yourself...
Also I think that you might be missing the incredible after market hop up uptions available nowadays!
These are lots of fun too.

Nothing is stopping anybody from disassembling a RTR and rebuilding and upgrading it Btw!

But it is true that the hobby has become much more mainstream.
So regular people (non-addicts ) can have a cool car too...
But this also means more second hand parts!

From your story it sounds like you like Rc cars. (edited)

Yes, I like rc cars.

Let me give you an example of a beautiful after market part that costs $6 :



Getting this in the mail makes the heart beat a little faster too...