In my experience most front-end marketing copy gives a very deceptive idea about features that are actually implemented. If I’m considering using a system I almost always look for a pricing page, then hop to API reference and look at the methods I’m interested in using. It’s quite often the case that there is a weird caveat or it’s just plain bit implemented yet. I find guides and boilerplate useful for taking a service for a test drive, but the goods have to be there in the API docs or I’m a pass.