Because at high frequencies because of the forward transmission through the Cc(basically a zero @ high frequencies) there would be no gain left in a single stage.
However in a two stage, you would design it in such a way that stage1 still has gain.
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Isnt what does miller compensation do is just eliminate gain at high frequency to make sure gain<0dB before the phase reach 180degree?So what does your comment mean for gain at that time?
anyway thx for your comments, they are good,