So Google Docs email notifications (about comments being resolved) have added an AMP HTML to their multipart/alternative package. The sizes of the three parts I just got: text/plain 2.2 KB text/x-amp-html 37 KB text/html 18 KB Shouldn't the AMP half be... smaller?
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Yes, the AMP HTML version shows slightly more context around the commented text, which seems like a UI improvement that ought to be in all versions... but that's not nearly enough to justify the doubling in size.

May 22, 2019 · 2:48 PM UTC

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Replying to @davidbaron
- more styling - more context - refresh logic - commenting logic - resolve logic Basically it is comparing an app to a plain HTML page.
Replying to @davidbaron
I dug into this for a sec, as there shouldn't be an inherent reason. the amp version is just more webby. it contains a lot more standard html (as opposed to the "email" html that is consistently horrifying).
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Replying to @davidbaron
One important thing to note is that the size of the text/x-amp-html part is not allowed to exceed 100KB in Gmail. We're looking into making this part of the spec.