We as a society should be rethinking the term "security", if it's come to mean submitting to being jerked around however best suits some private company's interests instead of our own. If there's a central platform for its security benefit it should be democratically controlled instead of controlled by what are effectively feudal lords, or perhaps even an occupying force

I'm not sure how it works the way where you live but where I live, the way the banking apps are implemented completely violate MFA. They rely on SMS verification which is absurd since if you're phone is already compromised, no doubt your SMSes are too. There's no true multi-device authentication in place and this has led to a huge number of victims being scammed after their devices get compromised by a phishing attack.

The desktop and phone are both insecure, proper security should not have all your eggs in one basket.

Which is the point. Why do we need this security when the most virus riden PC can access my banking website.

There are no banking apps on my computer.