The vast majority of issues will arise from software defects, not hardware defects. So rather than switching to a 30 year old cpu, increasing the quality contr

The vast majority of issues will arise from software defects, not hardware defects. So rather than switching to a 30 year old cpu, increasing the quality control and testing for the software would be the better aproach. Also, as some peope in this thread have mentioned, a smart smoke detector should be designed in a way where if it fails it becomes a dumb smoke detector, but the actual smoke detection and warning should still work.