Maybe there's some linguistic problem (English being not my native), but I wrote about the power of making decisions, of telling you what to do and what not to. It really isn't applicable to junior positions, but if you're one of the most senior developers on a project, you might well doubt the competence of the project manager to make tech-related decisions. Micromanagement aside, you and PM may have serious disagreements on what technology stack to move to or buy-vs-build decisions.