Yes, I agree with you 100%. For me, i dont have the time to deal with the dealership, but I can understand the warranty argument. I still believe that you can source the parts yourself and have the dealer put them on if you like for much less than sourcing them from the dealer.
I am not in the business of judging people for choosing one way of doing something over another. We need to work within our comfort zones. For me, this is only a truck and I got a good price on it, so I am not too worried about it. Also the parts were only a little over 100 bucks so if something went wrong I have no issue buying more. I just wanted to help people who want to tackle this project themselves. If you feel that this is beyond your skill level, outside of your comfort zone, or that you may damage your truck I recommend that you have it done by the dealership for sure.