The hard part of open hardware isn't the technical complexity by itself. I'd even go so far as to say there is no such thing as something so complicated we can

The hard part of open hardware isn't the technical complexity by itself. I'd even go so far as to say there is no such thing as something so complicated we can only make a closed implementation of it, just see Linux. The questions are more like "Do you want to fund the hardware investment, including legal certifications since this is consumer radio technology, on the hope it'll sell enough to make it back?", "Do you want to continuously design new versions to new standards every 5 years so it doesn't just become obsolete anyways?", "Do you want to maintain the firmware and driver, answering all of the issues that come about connecting to thousands of other devices across thousands and thousands of pages of standards behavior you or they implement poorly?", and, moreso, "Do you want to do this for the rest of your life all out of principle that client Wi-Fi chips, which the high end of the latest generation go up to a whopping $16.55 per in bulk, sometimes have bugs and you can't go in and just fix the particular bug you want to? Now sure, maybe you can convince your closest 10 dozen friends interested in open source hardware to not put everything on one person but at the end of the day there are a few people it's going to be a significant burden on and they have to see it as a worthwhile burden otherwise nobody is going to run the project. It'd probably be easier (though not easy) to stir up enough support to convince an existing manufacturer to make their firmware open source instead.