> That said, we all enjoy the fruits of their labors ...
Well, we also enjoy the issues. When you talk to them they are extremely uncompromising in practice and extremely tribalistic. I think “tribalistic” is maybe a better word for what I feel is an issue. “Not invented here syndrome” reigns supreme in open source and in general it's full of extreme fanboys who aren't willing to admit anything is wrong with “their tribe” and aren't willing to acknowledge any issue whatsoever and defend everything to the death.
The opposite is also just as true though. Many of the users and figureheads will believe everything is wrong with “other tribes” and refuse to acknowledge any of the merits and good ideas.
Proprietary developers have no allegiance but to money and there's something to be said for that. They just work for a company because it pays them and will switch to another company when they get a better contract there and in many ways that makes far less loyal and thus level headed about many things when talking to them.