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Can you back up this claim? Have you seen google.com's own page source?

Which part of it would be considered unfavorable? Perhaps it's harder for a human to read and understand, but all of the content necessary for Google to understand it is present in that HTML source.

You may have missed it if you hadn't scrolled to the right.

Try this: view-source:https://www.google.com

Minifying HTML, JS, CSS is a common practice

https://search.google.com/structured-data/testing-tool/u/0/#...

The Structured Data Testing Tool doesn't complain.

We'd need someone to try it out and get the results of the other Google Search Console tools to know for sure, however.