It sounds like you've had a lot of bad PMs (or been one yourself).

Almost every PM I've had has been awesome. They understand the product and the customer far better than me, and help communicate exactly what I need to understand about both, so I can do my job (as a coder).

Also they have zero feedback on how long something should take. They are hyper-focused on what the business needs and when, but that doesn't make them pressure engineers to do anything faster unless it's a case of "hey this important thing just popped up; how quickly can we solve it?"