90% agree with you. I don't agree with you about keyboard making no difference. Yes mechanical switches are a huge step up from rubber dome cheapies, but specifically Cherry MX Blue switches, as used in the Blackwidow, are the least suitable Cherry MX switches for gaming, because they do not work well for multiple keystrokes/hammering, among other things. Cherry MX Black and Red switches are regarded best for gaming.
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You do know that there is a version of the Blackwidow with the brown switches in, right?
It's really mostly subjective which ones are the best for gaming, but most people complain largely about the clicking sound it makes. I did read that article a while ago as well, but actually most of the other sites says the blacks are best for playing games and the blues 2nd. I have seen some say the high actuation point on the blues make it harder to double-tap buttons but honestly, it's still much easier than any rubber dome keyboard anyways. Some people just really like to nitpick, they're worse than audiophiles. To show you how subjective it really is:
http://www.gamersedge.co.uk/2011/09/mechanical-switch-guide/
It basically just says, it's down to personal preference.