I can design hardware - but as a programmer I know I'm not very good with it and avoid it. I know when I design something it will be subject to things I barely understand like RF and cross talk. I could get a EE degree (either formally or just by self study), but that would be a lot of work and so I think it is better to not do that. Hardware developers fail to understand they are not very good at software and they don't understand the mess they are making.