That you own your npub/nsec and you can surf and use any client you want, exploring their peculiar features and use the one you like most, or more of them simultaneously, without having to worry if your follows are using the same or not.

Also the fact that in the future I think users will have the possibility to set their own client like now they set their profile page.. I imagine a future where everyone basically has its own client and relay.. Maybe in 10 years you will have a phone with a bitcoin node integrated that will make you do that.. yeah off topic, just a thought 😅