That said this isn't exactly a "pick it up in a week" type of thing.
Considering that such fields as martial arts, driving, chemistry, gunsmithing, cybernetics and many others are exactly that sort of thing in-game, your logic doesn't hold very well.
I'll give you martial arts, and honestly I'd eventually like to take it to a stage where you basically need an NPC to teach you at a decent rate, with book-learning being limited to heavily penalized speeds and low caps on the amount of skill. (Though ideally if you know a handful of other martial arts it should lessen the penalty because you'd be better at catching your own mistakes and extrapolating from them).
Driving honestly you can pick up the basics in a couple of hours, and a vast majority in a couple of days (assuming automatic transmission, which current trends say that probably all of our cars in C:DDA are going to be unless specifically otherwise). After that becoming proficient is more a matter of encountering more emergency situations for you to deal with than any matter of practice.
Cybernetics a lot of the backend is done already by the bionic itself, but there are definitely plans to require you to either have a helper machine or otherwise make the process a bit more complex then "push against skin, press button".
As for the others it's more a gameyness thing, though I do have some eventual plans to slow down/rebalance progression somewhat, partially by further splits of recipe and skill knowledge. Even at low skills if I have a book that tells me exactly what to do I'm probably going to be able to pull off things that are well above my normal skill level, while without one I'm not going to be able to do much.
Mainly it's a matter of how easy it is to pick up a skill in the first place, with many things (such as chemistry or driving) being below what I would personally consider the "normal" skill threshold while others (such as echolocation sight) being above it. There's a reason why we don't often hear stories of people echolocating after all.