We have user-creatable feeds. What we don't have is a just this tiny piece: clients letting their user see the feed that was defined by a different person. It is a good idea and should be easy to do.
Can't you login with someone's npub?
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Yes, but you'd only see it while logged in.
There's no technological reason why you should have to do that, as lists are public data you can display.
That is how you can do it today. But logging out and in again is a pain and shouldn't be necessary.