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Are you basically saying "we were terrible for years therefore we will be terrible forever and there is no point in trying"?
Secure and stable systems are achievable in software (mechanical systems don't even compare, as they rely on security through obscurity and not cryptography), and open hardware is a necessary prerequisite. Currently the entire industry is crippled by proprietary software norms, and that affects even the foss projects, as they (only) have to adhere to the standards set by those norms. When we have international standards of quality and a number of companies competing to produce objectively the best implantations/builds of completely foss cryptographic software/hardware, with mandatory warranties and guarantees(just like any normal engineering industry), and they continue to miserably fail for several decades, then and only then it might be reasonable to doubt the feasibility of such systems.