When I got into the hobby, some 15 years ago or so, I got an off road car that was already prebuilt as it wasnt new.
I didnt understand how to take it apart and clean or repair it for a while without someone showing me, but if I had got it new I would have had a better understanding earlier on.
For me, that's why I would suggest anyone coming into the hobby and racing that they buy a kit, as they need to have first hand knowledge of how their car is built.
Some people may be more inclined to give up the hobby if they cant fix a car, but if they know from the start how a car is built it will get respected more, rather than something thats all ready to hit the track.
Don't get me wrong, not everyone enters the hobby and can't maintain a car, but i'm more than sure that it helps if you have some knowledge