Why does Jhin have 330 base move speed while most other ADC's have 325?

I thought Jhin's weakness was supposed to be his immobility. So why does he have more base move speed than {{champion:22}} {{champion:51}} {{champion:42}} {{champion:81}} {{champion:222}} {{champion:429}} {{champion:203}} {{champion:96}} {{champion:21}} {{champion:18}} ? The other ADC's that also have 330 or that outclass him are {{champion:119}} {{champion:104}} {{champion:236}} {{champion:133}} {{champion:15}} {{champion:29}} {{champion:110}} {{champion:67}} who all use their mobility to get in and _out_ of a fight. EDIT: Poor {{champion:82}} also has 325 move speed. :(
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