I guess it depends on your view about the greater "purpose" of Bitcoin. While self-custody is obviously the optimal way to hold bitcoin, I don't believe having the ability to self-custody is the be all and end all of Bitcoins existence. You can already self-custody fiat cash.

Its more about the solid monetary properties.

Everyone doesn't need to use bitcoin natively for Bitcoin to fulfill its objectives. Most will use it custodially - even bank with it! And that's perfectly fine.

The most important aspect is that it can't be debased by governments.

(all in my opinion of course)

And i guess to bring it back to your post, that is to say LN works great when those facts are accepted.