This is indeed one of the issues I still didn't fully wrap my head around! Currently clients just use the same bunch of relays as defaults, and let you (maybe)

This is indeed one of the issues I still didn't fully wrap my head around! Currently clients just use the same bunch of relays as defaults, and let you (maybe) customize the relays you want to connect to. I think this is sub-optimal for another reason, besides the one you mentioned (discoverability?): you don't necessarily control where your data is stored, and these relays might disappear without notice. It is a great way to broadcast status updates, but not great for having an archive of your own data, that you can trust. I assume this will change eventually, with paid relays, which will have the incentive to keep your data around, OR personal relays - which is what I am building as part of my CMS - basically I want all my data to have one "canonical" location (my domain) and be hosted on my VPS, which also serves my data as a web page with RSS... this helps me wrap my head around where my data is stored, and know that I always have a copy of it... but doesn't solve the discoverability issue, I guess, which ... IDK, it seems to be solved using just a "shotgun" approach: mostly publishing to well know relays.