"This tool 10x the productivity of software engineers" "GREAT! That means we can fire the people who do the actual work, and replace them with MBA robots, who neither understand nor care about making a good product" Pardon my pessimism, but in my whole career, I have never met a PM who actual did the work of driving the product vision. Most were just middlemen shuttling information between management, marketing, desi…
You seem to have a deep misunderstanding of the value PM's provide. What you describe as "just" is a challenging job.
Generally, the vision is set by the founder, and it can be written down in a sentence or two. There's a ton of work trying to translate that vision into something that is coherent across engineers, customers, sales, and marketing.