Oh, well I don't think the point that LN has found product market fit as the open payment protocol has been discussed hardly at all, so I wanted to start the conversation. The fact LN is enabling nostr zaps is super cool but not in and of itself a demonstration of it being the open payment protocol. It is the emergence of Fedimint and Cashu e-cash systems that largely demonstrate that LN is becoming that as well as Ark and statechains support for LN as OPP. 

 Product-market fit would require LN to have users, no? 

 But sure, LN has been thought of as the network that integrates multiple custodial services and layer 2s for many years now. I don't know if this is a new insight, but I may have misunderstood you.