[excuse-me]

You still have an adjustable exposure time between the pixel reset and read, which you can make pretty small (<1ms)

But the real problem comes from the time taken to read an entire frame. On a cheap camera this is about the frame time because the electronics is slow, but on a high end camera it is still often close to the frame time because you have a lot of pixels and there is a limit to how fast you can read while still having low noise. Some scientific CMOS cameras get round this by having massively parallel outputs.

The problem gets worse at 48fps - if it takes close to 1/48s to read the chip then a moving object will have stretched across the entire frame from top to bottom. In the worst case a vertical post in a fast pan will be at 45deg. A 24fps camera run at the same pixel clock only has half the effect.

The cameras do have software to try and correct this - basically they look for vertical edges and de-skew them, but this puts in artifacts that you don't want in a Hollywood movie. The other secret is to not fast pan at 48fps.