What do you mean by 0-conf channels?

You mean a totally standard Lightning channel, but where you consider the channel "open" even before the funding transaction is confirmed?

So a total beginner, who has never held any bitcoin before, can receive their first 10-sat payment and build a channel from it immediately?

The fees for the funding transaction could be greater than 10 sats

Who will provide inbound liquidity for the 0-conf channels?

For tiny amounts, I don't think there is any alternative to Cashu and Ark

To get a balance that is safe and secure, after your first few small payments, I think an Ark round is the only cheap option

Non-custodial Lightning only makes sense when your balance is a bit bigger

That's why I hope to see wallets mix all of these systems, allowing users to gradually transition through all of them