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 Some clients have "app relays" because they haven't implemented the outbox/inbox model yet and are just talking to these specific app relays and none other, some use these "app relays" as fallbacks for when they can't find anything using outbox and other heuristics, like Snort. Some clients don't have the concept of app relays, like Gossip and Coracle. Some apps have search relays in a separate category, like Yana and Amethyst. 
 Ok, so if I understand correctly, the general idea is to setup your inbox/outbox relays plus some other relays based on the client and on what you want to do with it (social, chat, etc...). So in my example above I should only set inbox/outbox relays plus some other "read" relays for everything else (whether they are called app relays, search relays or something else doesn't matter). 
 I don't think I can offer general advice, because each client will behave differently. Clients should probably guide you better, or set up some nice defaults for you. 
 Oh, last question: let's say I change inbox/outbox relays, but I don't want to "lose" events, would you say rebroadcasting everything I have written to the new ones is the correct thing to do? How would you manage this situation? 
 Yes, rebroadcasting is the correct thing to do. 
 I feel like (from a user perspective) there is not a proper relays "standard", making them not really portable between clients (a part from inbox/outbox ones), am I too harsh on this? Maybe it need to be like this because it depends on the client use case, I don't know.