Ask the same question to a university professor teaching students for 30 years. You may be surprised by their answer.

I agree. It would certainly take decades for them to master the technology. It might even take them 50 years. A lot of the knowledge required is implicit in the industry taken as a whole. Put me in the stone age with a manual for making bronze. I would be proud of myself If I managed to forge something useful inside of a lifetimes work. Where does the ore come from? How do I extract it? Precisely how do I get the fire hot enough? Similarly, if I knew how to create a warp drive, there is absolutely no guarantee that I could actually build one with current day tech. It might take a decade just to produce one of the required components.

Just to add to your point, think about how these electronics are actually designed and developed. You need lots of CAD and CAM to get working chips out the door, and you don't get those without already having working chips. Essentially you need earlier iterations of electronics to even build the next iteration. A single iPad isn't going to help much, unless it's loaded with schematics and data for entire generations of electronics leading up to it.