Great, I'm now that consultant
Designing hardware is like having kids. It was fun at the time, but now you're supporting the end product until you die.
Somewhere in my vast collection of abandoned crap is an Intel PROM burner and a matching 386 machine. Every couple of years I have to resurrect it to modify and burn firmware for a 1980's vintage antenna pedestal or two - based on a Z80 - last upgraded in, oh, 1996. Customers think it's too risky to upgrade to something modern, and I think it's far too lucrative to push the point.
Biting the hand that feeds IT
