I guess it depends on which organization you're part of. I've never really been told what to do in my 5+ years at Google. I usually just have an idea, say I'm going to work on it, and then do it. Most of my peers also work this way, and while more junior ones usually need some assistance with coming up with ideas which align with priorities, it's not like management is telling them what to do - usually a senior team member helps them. PMs help set higher level goals and priorities, but not unilaterally. Managers provide incentives to align to org level goals and priorities but balance that with bottom up driven ones. This has been true for both teams I've been on in two separate orgs, but I'm sure it's not universally true throughout Google. Prior experience at companies previous to Google gave me almost no autonomy.