Comment by Telaneo

> If you're building out a brand new system, why not make use of the computing device with input/output capabilities (that can be used to confirm amount, payee etc.) almost everybody already has in their pocket/purse anyway and instead rely on merchants being honest and only taking what they're owed out of your account without your confirmation?

Because I'd like to be able to pay for things even if my phone is out of battery. I'd also like my grandma to be able to pay for stuff without bringing her phone to the store.

Don't get me wrong, I like being able to pay with just my phone. But I'd like a fallback option (in theory, cash is this too, and I do carry that, but it's used to rarely these days).