I've been searching for the install instructions for a humidifier so I can evaluate whether I should attempt installation myself. I came across this rationalization of why I am not entitled to make that decision myself - it has already been made for me, because I do not know my limitations.
I can clearly state that I am able to understand and evaluate those limitations much better than you or anyone else.
As far as your analogy of building a house from scratch, I don't see anybody secreting the instructions or not selling the components because they don't think we're competent. And to carry your analogy even further - I most definately CAN find instructions on building a rocket! I just can't find instructions on installing a humidifier.
Sheesh - this is a DIY site! Don't be telling me I shouldn't do it myself!
(and by the way, the reason install instructions are not included is because that is the agreement that they have made with their installer network).