Citation needed: I've maintained direct sessions over the fabric (not via route servers) between my AS and peers' ASes, with over a hundred ISPs, at some of the world's largest IXes. Out of those more than a hundred, maybe 3 used MD5. We also have a lot of PNIs direct with other carriers with POPs in the same building. Sorry I obviously can't provide a copy/paste of the junos config showing all the peers.