The great thing about PEX is that they made an expensive* tool that makes joining pipes like 90% less skill-intensive.

I'd love to see something similar done for electric wiring. I'm picturing something like an electrical box that you can directly connect Romex that's been stripped with a special tool, and then a circuit-breaker-style snap-in for the actual receptacle. The parts/tools would cost more but might dramatically speed up the installation.

*relatively expensive, especially in the early days.