They effectively can't to the extent that it's not a social norm to enforce that level of security theater. You are arguing in favor of normalizing an increased degree of security theater.

My point here is that this specific step on the slippery slope is a cliff, not some infintessimal change, because now the authentication is done through a program and not copyable information. If verification-can technology is standardized on an OS level and advocated by four out of five tech priests (and maybe even enshrined in law (think of the children)), then you are going to be drinking a whole lot more mountain dew in the future to say the least.

If it was just a single bank or something that tried this, people would get pissed off, leave, and the frog would not be boiled. It takes a slow industry-wide movement to shift the standards of what is acceptible to the common man.