Something needs an nsec at some point unless you're doing your cryptography with pen and paper! I use Amber as a signer (on GrapheneOS with network permissions disabled for that app)
I hear ya though, you're definitely not wrong about nsec security! And I was bit off about PW/nsec equivalemce 🙄
Just thought as an amethyst/amber user, it was an odd reaction to nostr:nprofile1qqsyvrp9u6p0mfur9dfdru3d853tx9mdjuhkphxuxgfwmryja7zsvhqpzamhxue69uhhv6t5daezumn0wd68yvfwvdhk6tcpz9mhxue69uhkummnw3ezuamfdejj7qgwwaehxw309ahx7uewd3hkctcscpyug s suggestion, because I'd love to conceivably install & open proton, click a button, sign an event in amber (or whatever), and get logged into my (maybe just newly created) proton account. 🎉