With the mailbox model, yes. Especially profile and relay metadata needs to be easy to find.
You need some relays that you can traverse, to get from one data pool to the next, so they need to hold enough notes long enough, that people can find friends and set up hops with their frens.
And then your WoT is your public square and the squares overlap.
I don't need regular Access to all of the notes being generated in Mongolia or Argentina. I just need a way to connect with my two bros in Mongolia and Argentina, so that I can download their notes to my preferred hosted relays or my cell phone.
Rather than one gigantic data pool (a la Twitter), you have lots of seas, lakes, and ponds connected by rivers and streams. It's slightly slower, but not noticeably so, and the data moving between the different bodies creates some redundancy.