And the RF is a pre-certified module. Of course hardware is easy when you've offloaded the hard part to the supplier. Not to mention, a three year turn around? For this? Three months, six max with mistakes and reworks would be industry expectations "pre-LLMs". Everything is easy when you have 6x to 12x the timescale your competitors expect.
"Do things that don't scale!" is standard founder advice for a reason. The fact that no one else has put in the work means you get to sell $150 MIDI recorders... for a while. Which, fair enough, might just sustain a one-person business.