I agree with what you are saying except that if Recteq used high grade stainless, I don't think that would have happened. I have a Summit grill that I got from
@LMichaels which has a lot of 304 stainless for the shelves and huge condiment trays. This grill sat outside both at Larry's and my house in all kinds of Midwest weather and never showed any rust when I finally restored it. The REAL stainless just needed some cleaning.
I think a lot of buyers trust that when a manufacturer says "stainless" it means the metal is highly rust resistant. Recteq and Weber, too, have grills with lower grade stainless where this is definitely not the case.