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 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.