I occasionally see badly-written reports that will be read and picked apart by other stakeholders, and bidders who blatantly ignore proposal requirements. I have also attended meetings with technical experts who had no idea what they were supposed to discuss.
These are usually not signs of incompetence. They indicate arrogance - someone or an organization that thinks that they are above such inconsequential things as evidence or support for their position.
I have never been able to just waltz into a room and expect that everyone will think that I'm brilliant (or even that I know what I'm talking about). I've never been the "golden child" or the person who everyone can see is "going places". I was an academic nonentity in high school and in college. After I'd established myself in the field, I still had to fight to prove myself when I was job hunting. And I'm still (like, this year) getting strange "wow, you can give a presentation" compliments years after I thought that particular question was settled.
All those ridiculous experiences have given me a decent-sized chip on my shoulder. But they also mean that I take my shit seriously. And when I offer a technical opinion, you'd better believe I can back it up.
I have been gratified to see that certain persons/organizations that have been particularly careless because of overwhelming arrogance have gotten burned recently. Of course, some of the offenders that I've worked with/around more closely seem to be doing perfectly fine. Sigh.