Yes, LN is far more complex. But it is not custodial, so it's not somehow irrational to treat it entirely differently to fedimint or federated sidechains.
There's relevant history that I think people are overlooking. Do people remember OT (Open Transactions) or even earlier pre-bitcoin implementations like Truledger, Loom? When I asked elsirion at the El Salvador conference he hadn't heard of OT.
Honestly I don't bring that up as a dig against people, it's more to me important to try to learn: what is it about these constructions that somehow hasn't gained traction in past iterations, even if on paper the properties they offered are very attractive? The natural conclusion is: ruthless removal of central points of failure is the key thing, and federation generally doesn't cut it, unless we can find some new twist.