I think a properly modular system, similar to the ATX computer case, would be a practical 50 year computer, even if no single part lasts that long. The ATX mot

I think a properly modular system, similar to the ATX computer case, would be a practical 50 year computer, even if no single part lasts that long. The ATX motherboard form factor was developed in 1995 by Intel. Today motherboards are still made by AMD and Intel that meet that size. Previous attempts to make a modular cell phone by Google's Project Ara ended in 2017. https://hackaday.io/project/177716-the-femtotx-motherboard-standard https://hackaday.io/project/177716-the-femtotx-motherboard-s... If a system reuses even 10%, that still reduces the waste that goes into manufacturing a new replacement, such as a system fan or chassis.