Not sure if Jami has this but I was looking into Manyverse (NOT METAVERSE) which is a P2P social media app which works similar to Jami, however not only connections are between devices but relay servers are also used which do not store data but help devices connect to each other.
I like Jami for its P2P nature but relay servers if they are not in Jami would be useful for making connections stronger especially until Jami gets better with P2P connections between devices.
I don’t know much about Manyverse, but based on the description, I believe for Jami the TURN and DHT proxy features (but mainly TURN) address the use-case of when direct p2p connection is not possible e.g. due to strict firewall rules.