From the point of a non-technical user, seed phrases are more technical than opaque strings of characters, just by virtue of having a format. Users are pretty used to opaque strings, aka passwords.

> Copying data to an external computer or drive isn't needed, a software key manager isn't needed, computer storage isn't needed, a printer isn't needed, a protocol for securely transmitting the key within a network isn't needed and etc.

If you're not doing any of that with your phrase, what are you doing with it? I'm saying that seed phrases are not better than nsec (and worse than ncryptsec) for the very common use cases of sending them via digital messaging and for entering into apps and password managers. This is 99% of what people are doing with their keys, so we should optimize for the format that supports that.