When AMP was about to be released, I was the engineer in my company in charge of deciding whether to implement it. I discarded the idea, but months later we realized Google was not joking about the SEO boost, and we had to backtrack very quickly in order to not lose to the competition. I regretted saying no because I missed the opportunity, but I was still convinced it was a bad idea overall.

Now that it's gone, I could not be happier. Not only did AMP made the internet worse, but it was a pain to implement, a bad experience for users, and a bad deal for media companies.

I was on the opposite side. When AMP4email came out, I worked at a publisher of email newsletters. I pushed our CTO to implement it. He was less than enthusiastic. We ultimately decided it wasn't worth the effort and now that looks like a smart idea.