I agree that it's the usual case, but on the other hand, right now I got quite frustrated with a project because the manufacturer has only provided examples and

I agree that it's the usual case, but on the other hand, right now I got quite frustrated with a project because the manufacturer has only provided examples and tutorials and there is literally no reference material - which was fine when I was starting out, but horrible for debugging where I'd really need just a few sentences describing how exactly that call works and I'd want an exhaustive list of what my other configuration options are there and what they do, not an example of doing something close to but not exactly what I need.