Success often hinges on making something people want. Marketing done well is hugely helpful in determining both what people want and whether they perceive a product as a solution to their problems, and it can help guide product development with marketing analytics and other user data. I don't think I'd ever have been successful without a marketing background.
To take it back to the original point, I will never move to AMP. I spend a lot of time speeding up my pages through simplification, caching, and any other trick that makes sense (deferment, lazy loading, minification, combining, etc.) But there are a lot of reasons to not want your link to start with amp.google.com when someone shares my page.
* Any links to that URL rely on the good graces of the search engines to "count" for rankings and continue sending traffic. This is especially worrying if I decide to change standards. Will my rankings tank? Will the crawlers get totally confused and think I have a bunch of 404s? Both have been reported. These are not risks I'm willing to take with my sites that took so much work to build and promote.
* When someone shares my page I want my URL to be clear - not some google.com URL. That's both confusing for the user and bad for building a brand. Even if it was a cname to my own subdomain I'd feel better, e.g. amp.mysite.com
* Aside from the reason above, the lock-in is philosophically problematic. I intentionally use cross-platform apps on my phone because I don't want to be locked into an ecosystem. I don't foresee switching to Apple, but I didn't foresee switching to Android either. The point is that I could. This freedom is important to me.
* I don't trust that Google is committed to me and my content. Just look at the YouTubers getting screwed over by Google's lazy copyright policy. What makes you think they're going to suddenly staff up and/or care more on web content?
Anyway, as a writer, marketer, business owner, and web developer: fuck AMP.