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It took ages from the theoretical invention of the MOS transistor to us being able to grow practically good enough oxides (which aren't riddled with interface traps)...

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More like a decade, unless you refer to the Lilienfeld devices.

Yes, I was thinking of Lilienfeld. What starting point are you taking?

Bell labs tried to build a FET before the bipolar transistor. It's not so clear which theory the Lilienfeld devices are based on.

Imagine how long it would have taken if silicon wasn't this ideal.

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