In general I agree with both of you. Filtering can be done either side. Personally I prefer client-side filtering and dumb relays because it puts me in control. I don't get to choose the relay that has the right censorship policies. The people I follow choose the relays, not me. But that only affects their posts and it makes some sense too. Asking relays to compute WoT so you don't have to upload long lists of pubkeys has performance consequences and I'm not sure if it is better or worse.