[makeitdouble]

the 100-200ms is a big deal, and it's not some random spec, JR made it a binding requirement to use their system after real world evaluation of the latency impact. So yes, Felica is also sub 200ms for that part.

As a user, there's so much going on when touching a card at rush hour for instance, getting virtually no perceivable latency helps us to focus on the rest (distance, angle, check the screen, distance with the person ahead). As you point out in other comment, of course the design of the whole gate comes into play to help the user deal with it.

It reminds me of the microsoft study on how low the latency has to be to become transparent to the user. Except JR actually cared about their results.