Which is why I thought NAMSA came into existence in the first place, to act as the governing body and organizer for (non-hobie only) regattas to be held at various locations. This would alleviate the local clubs from the various issues you bring up.

If I understand you correctly, with the US Sailing insurance (Chubb) programs, only those unicorporated fleets/clubs would benefit from the liability protection purchased by the national organizations.

Those fleets/clubs that sought incorporated status (to raise funds, hold local events, etc.) would have to purchase their own regatta policies for whatever they do.