It is NOT the same thing. Even using the same password across websites is not the same as using the same nsec. You can go and change your passwords if one gets compromised and even recover from a compromised password in most cases. You can do that with an nsec. The two things are not equivalent, even if the same bad practices are used for both cases. If I show you my nsec I can't just go change it. Everything is gone forever. That is a lot more catastrophic than even using the same login for every website. For one, an attacker would need to know every place I have an account and go there separately and do something bad. An attacker with my nsec would instantly have access to anything I have on Nostr forever and there's fuck all I can ever do about it. Those two things are clearly different. The idea that we should be throwing everything onto Nostr right now is bananas, and that's the only point I'm making here.