Input stage with MOSFets?

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I was just wondering, why are amps with MOSFets in the input stage less popular than amps with BJTs of JFets?

Except in the amps made of 100% MOSFets (a la Pass), input stages nearly always use BJTs or JFets?
Is there a reason for that? JFets are sometimes used because of theys high input impedance, but MOSFets have an even higher input impedance!
 
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