[skywhopper]

Because the criteria will inevitably be biased towards technology and techniques that favor Google, Chrome, AMP, etc. If you trust Google to be an unbiased arbiter of objective measurements of website efficiency, you are giving them a lot more credit than I would at this point.

[jefftk]

Visit an AMP page in Lighthouse and you won't see an especially good score. Lighthouse doesn't special-case AMP or pick metrics that would make AMP look good.

[adrianN]

Just because a monopoly is not acting maliciously today, that doesn't mean that it won't tomorrow.