Curtains vs PoG

[NajdorfDefense]

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If he does not fall apart at the seams he may very well play 20. f3 in reply to 19.. Qd5+ and use f2 for his rook. It may appears awkward but he's up a pawn, so he's allowed to be a bit backwards for now...

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We have a lot of good choices against 20.f3. I don't really think it's best.

I looked at 20...Qc6 maybe intending Qc2. Also 20...Rc6 and doubling rook ideas only gain by having the pawn on f3. And 20...Nd7 is still possible too.

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I don't understand how you can say we can't get a Rook on c2 but we can get a Queen there. That's inconsistent. It's one or the other, right? Or am I missing something deeper here?