Agreed. Most owners don't have any problems.. Like I've said before, forums attract a lot of attention from owners that aren't happy because it gives them an outlet to express those feelings.. I don't blame them though.
Welcome!
As far as to early to tune, that's an opinion. I did my first diesel with 3000K miles on it. Never had an issue, this one is stock however so it all depends on what "risks" you want to take.
No doubt a tune is beneficial, but loosing that warranty (if something bad happen) would be...
Nope, and not saying I shouldn't. I just haven't in the last three modern trucks... I would love to know if it helps as if I can use anything to prolong the life of my vehicle, I will.