The problem is computer technology in its current state is fundamentally hard to trust. Without reading the source code and knowing the full source of all external services, and hoping the terms of service or external source code don’t change in the future, you really can’t trust anything. There is no authority that can guarantee “this will always work until it physically breaks, and even then be repairable”. Conventional parts and circuits can be more easily repaired and even reverse engineered if needed.