Well, about any client already supports this in the sense you can log-in with an npub; but i mean you do effectively the same thing whilst being logged in with your own nsec, and can just follow, comment, post, like etc.
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default follow lists are so bad though because they rot, people leave
Perhaps you misunderstand, because i am not talking about 'default follow lists', i am talking about me being able to addopt your perspective in 1 click (maybe 2, or 3 but you get the point).
The way primal has it implemented is far to hidden, but case in point:

