All machines will have issues, they are very comparable to cars in this way. Some cars have absolute garbage designs that can't be fixed no matter what you do. This is also like machines that have been designed and built poorly; You can't get the machine to stop vibrating... you can't get the kinematics to stay in position... these machines are "piles of crap" and I would NEVER buy one.
A perfect comparison using cars, time takes its toll on all things mechanical and electrical. Anything that moves is wearing out when it moves, rate of wear is arguable, but it happens. Plastics get brittle and breakdown over time when constantly exposed to coolant. Even capacitors have a limited lifespan. So yes, like cars, one that wasn’t a pile of crap when it rolled off the assembly line can easily be a pile of crap once it’s seen lots of use causing wear and deterioration of all the systems. If you really want to use cars as a parallel we can talk all day about the German vs Japanese resale values and why that is the way it is. I’m sure that will help your case for dmg.