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Btw Suica is 200ms or less.

To the parent, the credit card system will be parrallel to Suica/passmo, not a replacement. People would freak out with a system that isn't prepaid (think school kids), doesn't fully work offline and is twice as slow as the current one.

The problem isn’t technical, it’s social. I don’t want my bank, and some “global payment network” that can easily lobby its way out of real data oversight, to know my transit patterns and habits.

I don't think that data about how frequently you pay for mass transit, is that valuable.

"This guy takes the train once early in the morning, then again in the evening", exactly like 10 million people in the city, maybe?

If that's true why would Visa/mastercard push so hard to get into so low tx ( <$1 each) processing? What are they paying/losing money for?

It's data. For some reason they're willing to pay to get a transit data for as much as possible people in several countries.

Not true. Visa frequently fails.