To me it seems like reticulum is an overlay network - like nostr, but it comes with more complexity because it tries to address problems like path finding. 

I think it would be a mistake to make one overlay network (nostr) depend on another overlay network (reticulum) which still depends on TCP-IP. Tor gives relays cryptographic addresses, but it's inefficient and unreliable as a transport layer.

I guess there is no harm in relays supporting multiple deferent protocols / technologies. Time will tell what works best...