I totally get that Google has done a lot of work on these issues. It is still the case that no website that wants good ranks should depend on Google executing their javascript. Implementing AMP, on the other hand, means that you know you're going to get a good mobile speed score.

In no way was I dissing Google's crawl or crawl team. I'm just handing out conservative advice for website owners.

(disclaimer: blekko Founder/CTO. Nice to meet you.)