I think part of the reason we're talking past each other here is that you're more focused on the specifics surrounding London's network while I'm trying to make generalizations for rail anywhere in the world...
To the best of my knowledge there are no frequencies that high anywhere on the T...even in Tokyo: Odakyu only recently moved up to 36 an hour (from 24) and that's on a 4-track line! But the current frequency is around 1 or 2 an hour, and there's a lot of room between 1 and 36
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The Victoria line is now 36 (at peak), I believe. With two tracks.
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The busiest subway line in Tokyo (Marunouchi Line) peaks at 33 trains per hour iirc. I don't know of any that go higher than that, but I may be forgetting something. Moscow Metro tops out at 40 per hour (90 second headways)
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Admittedly these are short (133 metres) and small trains. Not full size as in Tokyo.
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Marunouchi Line is also kind of short by Tokyo standards if memory serves--platforms aren't as long as on other routes
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Tube trains always have been short. And the Vic was built during a 1960s economy drive.
End of conversation
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