Here's your rebuttal: shine another light on your situation and suddenly instead of having half the messages ending up on google servers anyways, you have half of your email freed from google servers which is better than having all on it there, privacywise.
I imagine about 20% of my email correspondence is all it would take for Google to form a pretty accurate picture of my interests and habits and circles of acquaintance. That's the way machine learning usually works: you don't need a complete dataset to make useful inferences.
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Here's your rebuttal: shine another light on your situation and suddenly instead of having half the messages ending up on google servers anyways, you have half of your email freed from google servers which is better than having all on it there, privacywise.
I imagine about 20% of my email correspondence is all it would take for Google to form a pretty accurate picture of my interests and habits and circles of acquaintance. That's the way machine learning usually works: you don't need a complete dataset to make useful inferences.