Let's agree to disagree. I don't think you're taking into account the convenience slippery slop that will ultimately get users to use custodial wallets for everything, not just small payments.
Not to mention the protocol centralization risk you get when a handful of LN custodial providers control 99% of the LN tx volume. At some point, they can just do the same thing google did to email and the web. If the fringe minority don't follow their new specs, they are simply left behind. Fully captured.