Unfortunately lightning network fails on one of the most important things - receiving money when you have no money. This is the first experience for most users. And you really can't explain how this works to someone, ask him to download a wallet and send him 100 sats. And "You need to have money to receive money", while necessary, is ridiculous if for a moment you come out of the bitcoin mindset. I kind of liked the Mutiny solution with the fedimint integration, but of course this sacrifices bitcoin self custody...

So you have blockchain where your money is safe without you doing anything but you can't really work with small sums of money practically. Then you have the lightning network where your money is safe, as long as you are not offline for extended period of time. And there is ecash where your money are not safe and depend on the mint not stealing from you (although they provide anonymity), but you can onboard someone by even sending him as low as 1sat (and they can pay lightning invoices as easily as if they did have a lightning channel themselves).

So to summarise lightning has a big barrier just at the point where it matters the most - people who don't yet have bitcoin and are not exposed to the ecosystem.