Outside of our bubble nobody cares about that
There is always something you can do, we see it with phones, just add more gimmicks on top, the thing is smartphones are aimed at the general population and became a fashion/class/status symbol. Printers are just printers, they work just fine and most of them are used in pro environment (aka most people don't pay, maintain or replace printers).
> It tells me there’s a complacent market ripe for disruption.
Then let's disrupt coffee mugs, or the wheel... some techs are good enough that further """progress""" isn't required.
Most people who have issues with printers buy cheap ones and/or use them once every 6 months, they then proceed to complain that they don't work anymore and that all printers are bad. It's like buying a car and never doing any maintenance until it dies and then complain about reliability.
There's still room to improve insulation on mugs, and I dare you to go tell any car manufacturer that wheels are a totally solved problem with no room to improve (personally I'm hoping one of the airless variants gets to mass market so I never have another flat).
Some techs are good enough that people get complacent; that's not the same as running out of room to improve.
I kind of want to spend some time on this printer thing, now!