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Is it? I am not sure about that.
Think of the millions of differential amplifiers which are in use (as input stages for opamps). They are nothing else than a combination of common collector (drain) and common base (gate).
You are right. My reply was too simple. The common emitter also has high input impedance so it does not load the input signal. The common base has low input impedance. When you use a common emitter stage and follow it with a common base, you have a cascode and that is how common base is often used.
Vbe act as volage reference based switching.
0V input outputs hi and +.7V and above outputs low logic state. Also acts as inverter. this base emiter diode forward biasing voltage gives good control for drive voltage reqirements with respect to ground.
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