I don’t think that’s his point though (or maybe I miss understood him).
Self custody could scale. It’s a question of education and willingness of the people and maybe improvements on the LN layer, but not a change of Bitcoin itself. Also I don’t think it’s so difficult to hold your own keys of a Ln wallet like Muun, Breez or Phoenix. They are all self custodial LN wallets. Even if you back-up your keys of those wallets in the cloud it is technically self custodial, even if it’s not smart.
"Bitcoin has literally 0% chance of scaling globally in a *self sovereign* way without making script much more flexible."
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Having a self custodial Lightning wallet is self sovereign. Don’t you think so?
Does that ability scale to 8 billion users?
Most likely