If you're asking relays to filter based on follows of follows isn't that elevating the role of the relay? #pyramid has an inbox relay that filters based on follows of follows, but is that what everybody wants? People might want a different filtering algorithm, the influencer case was just one example.
I really don't see how this introduces censorship. Given outbox everywhere no one is censored. And filtering replies on your own notes is almost a personal thing that affects others very little. Readers should still be able to see replies to you from relays others than the ones you chose (they will probably automatically see replies from people they follow already, even if those are banned from your inbox relay).