@quixoticgeek Fare gates in Japan (at least when I visited 20 years ago) work differently. Their default state is open - if you try to pass without scanning a ticket, it closes. So the throughput is insane.
All systems have errors, but with this one they decided a few people getting through without paying is worth making it slower for everyone else. The default position is that most people are not criminals, unlike these types of gate which come from the point of view that everyone is potentially a criminal and given half a chance will defraud anything.
The ticket scanners were amazing too: two different sizes of ticket, you could put them in upside down, back to front, even sideways and they'd still read it in a fraction of a second.