Because it *is* 60 fps. Just not *frames* per second, just *fields* per second. It still means the scene is recorded 60 times a second, just not every line of it. Back in the age of tube screens, that created a great compromise between motion clarity and resolution, which is sadly lost with flat-panel displays where interlacing creates nasty visible artifacts.
On the other hand, low refresh rates in CRTs would cause one hell of a flicker, so 30 frames per second progressive scan were out of the question.
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