I disagree. Cold storage is the only way to provide full sovereignty.
L2, as of now, requires a hot wallet. That is not secure against a sophisticated attack. The protocol could be, but not individuals.
Multi-vendor multi-sig in cold storage fixes this.
Sure, LN for now it's very risky and for self-custody is very complicated, but i believe that in the future it will be as easy to self custody as onchain layer.
Do you need cold storage to be sovereign or having the ability and the choice to have your wealth in cold storage is enough under a bitcoin standard?
That's what i do with LN now, i use hot wallets, but i manage my risk, i only keep small amounts in LN. Only self custody is safe.
You need to be able to access cold storage to be sovereign. You can't walk across a border with an LN node backup in your head.
No one should ever store their life savings on a hot wallet. We've seen even devs can't gaurentee safety for funds on a hot wallet.
Cold storage for savings. This really has nothing to do with layer 2 in my head. It's the hot wallet component, and unfortunately L2 has to be hot as of now.