Ideally, an ideal amplifier, which only exists in an ideal world in an ideal universe, in an ideal society and used by an ideal person in an ideal fashion, has none of the problems associated with real-world amplifiers.
But we live in the real world, welcome back to reality.
In the real world an amplifier must always try to strike a balance between power and noise, so amplifier stages are designed according to their requirements:
Power amps - high power, high noise
Buffer stages - low power, low noise
Preamps/headphone amps - low power, high noise
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