Pointing to a Visa card to solve crypto scaling is probably not the argument I’d go for.

That's exactly how the Bitcoin's payment layer scales. Visa is just one solution, but that's probably the most popular one. The settlement layer doesn't have to scale, because it's possible to scale the payment layer. You get all the benefits of sound money with the usability of fiat money.

It scales by using the system that Bitcoin was supposed to replace?

Again, that’s not an argument for Bitcoin, just so we’re clear. This is an argument for visa instead.

Eh, that was an example that everyone can grasp. A more inline alternative would be Lightning Network.

No, Visa is a payment network that works with any currency. Bitcoin replaces the US dollar, not Visa.