Why aren't low noise amplifiers used for receivers implemented in oscillators?

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When I open textbooks I normally see BJTs, or FETs, in the feedback loop but never an ultra low noise op amp, or other type of very low noise amplifier.


I was hoping someone who has designed oscillator circuits can tell me why aren't low noise amplifiers (LNAs) normally used for receiver applications not used in oscillator circuits?
 

AFAIK BJT and FET in feedback loop of oscillators used for stabilization of oscillator output amplitude, i.e. as nonlinear devices. Amplifiers aro not very well siuted for this function.
 

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