The problem the amount of frames from which you choose. 1/50th of a second might seem a small amount of time, but a lot happens in that amount of time when it comes to motion.
I have a high speed camera on my phone so here's some examples, I dropped a penny sweet and freeze framed a screen from different frame rates.
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60 is higher than what the Prem have and it's a streaky blur.
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120 FPS is better, but there's still a clear issue with blurring.
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At 960 FPS you're at a point where there's very little blur disguising the objects position, but the Premier League is using footage almost a twentieth as clear.