Someone described by those first 3 things probably couldn't do much on an OS project anyway.
Unless you're creating OSS tools for e.g. developers, your final users are probably not as technical as yourself - so you might want to hear feedback from people that actually has to use your tool.
(Sorry, this is not really directed at you and I'm not picking on you, I don't know you at all! :) Your comment just reminded me of what I describe above)