I thought this too for a long time.  But then I realized if i have exclusive content, and publish it to certain relays, but there are other relays I dont like, I'd be a bit annoyed if they take that content.  There's gonna be a spectrum of opinions on this, I respect yours, but I have come to have a more complex view over time e.g. things like NIP-70 introduces nuances:

https://github.com/nostr-protocol/nips/blob/master/70.md