But some apps use only one of the other, some use both, some use neither.
No familiar with all the relays but I know some only accept write events, like muitny blaster relay
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And some only accept reads, like purplepag.es.
But each app has the relay management page designed differently. Confusing.
Use what suits you. Nostr is confusing but not really, when you understand that anyone can build on it. Different people, different clients, different style.