And I forgot about another thing too: the supply of people. While everyone and their dog can attend some six weeks coding bootcamp or teach themselves using free and open resources and can then start contributing to open source code, dealing with hardware requires a good education in fundamental physics, good amounts of money for components and tooling (a good soldering iron, air filters, fine-controlled hot air gun, a decent oven, the equipment and the chemicals for etching, a precise micro-drill, ...). Many people don't have that amount of upfront money and skills, and those that do often don't have the amount of free time to help advance open source because, as I wrote, it takes lots of time and money to deal with smart hardware.
Perhaps this was intended to be hyperbolic, but no, you can't become a kernel developer, say, in six weeks. You can learn to dabble in web development in that time, but you'll barely have taken the first step toward being a serious software engineer.
Much skill is needed to make a serious contribution to an open hardware project, but the same is true for many types of software.
https://www.youtube.com/watch?v=2b1UdOmxVrw
There is, as yet, no magical piece of software that automatically produces good layouts - not even for simple designs like this where signal integrity is of little concern.
You're talking about people doing FPGA work which is a totally different skillset than making your own PCBs - and even more lacking in people contributing to open-source projects because it is (at least in my opinion) even harder to get a grasp on, and capable FPGA development boards cost a boatload of money.
