Why do they need to be "maintained"? Assuming they're set up with good cooling and dust-free air, they just sit there and work. They can perhaps be slightly und

Why do they need to be "maintained"? Assuming they're set up with good cooling and dust-free air, they just sit there and work. They can perhaps be slightly underclocked and undervolted too at say 85% to run for a longer number of years. Same for the memory clock and power draw of the GPU. If any replacement was needed, it's a small part of someone's job.