You are right. The point is not to 'use liquid'... Liquid is just a temporary tool in order to 'stack sats' and manage lightning Liquidity among people who don't have the initial 300-500k sats to open a lightning channel (much of the world).

I posted this elsewhere... that once BTCPay has a 'Boltz Lightning-Liquid' extension available it will be everywhere. It allows people to accept 'non-custodial' lightning without having the initial lightning node.