People cannot steal your card info via proximity to your wallet over NFC if the wallet’s physical barrier blocks the RF signal.

People can't steal your card info via proximity to your wallet over NFC even without an RF blocking wallet. This is tinfoil hat security cargo culting, like putting tape over your webcam while leaving the laptop's microphone connected (audio from your room is much more useful than 2834823428 frames of your greasy face).

No but they can steal up to the pin-free amount of money your card allows. They can just hold a sumup to your pocket. Here in Europe most people use debit cards with non-reversible transactions and that limit is often 70-100€ which is quite a lot of money where I live. And they can steal a lot more if they follow you and shouldersurf your pincode.

I definitely use one of those wallets. They're quite convenient too.