Older devices are going to have limited capabilities due to their older technology, plus when they break you won't be able to repair them because of the unavail

Older devices are going to have limited capabilities due to their older technology, plus when they break you won't be able to repair them because of the unavailability of parts. A better solution is to build our own devices using readily-available parts, such as Raspberry Pis, and make the designs and source code freely available. Then these things can be updated as technology improves, and their cost will be low because they won't have their availability constrained by being out of production.