A kit wouldn’t be necessary if the retailers made it a little clearer what part’s did what.
They very rarely appear to be listed in any particular order or grouping. When it comes to driver’s in particular when someone for the first time sees all the unfamiliar terminology and unknown words being used I can imagine a lot of them just giving up there and then.
The information that I see is more suited to those who have a more in depth knowledge and and I don’t feel that it encourages novices.