I have yet to see good argument as to why the reactors on nuclear subs are "proof" of the viability of domestic commercial electrical reactors. They have differ

I have yet to see good argument as to why the reactors on nuclear subs are "proof" of the viability of domestic commercial electrical reactors. They have different commercial viability, enriched fuel and safety requirements. Plus I don't think the primary use of reactors on subs is to generate electricity. Not dismissing SMR for commercial use, but don't see how military subs / ships are relevant