Joinmarket doesnt require fidelity fonds, theyre optional. It also has equal outputs, otherwise whats the point?
Lemme rewrite that for the plebs reading the comments in this thread.
JOINSTR is COINJOIN OVER NOSTR
I know its confusing still for the non-technical plebs 
, but evolutions will come soon. Pay attention to nostr:npub1v6qjdzkwgaydgxjvlnq7vsqxlwf4h0p4j7pt8ktprajd28r82tvs54nzyr
Discussion
Coordination is the biggest issue, IMO.
Doing it over nostr has a huge advantage or else you are left out in the void trying to find people to coordinate the join with.
Its already hard to get p2p trades going in one region, this is even harder.
Can you share a joinmarket cj transaction with all outputs having same amount?