Here's the thing about Weber warranty in later generation Gennys (about 2009 - 2016); all of the "bulletproof stuff" has a great warranty, i.e. the firebox, lid, flavorizers, etc. What didn't have much warranty coverage was the frame, panels, cart, whatever you want to call it. What I've seen happen to quite a lot of them is that everything to do with the "grill part" of the grill was still in great shape, but the freaking carts started rusting out from underneath in just a couple of years. And no, Weber usually wasn't very helpful with the issue, other than to offer to sell replacement parts.
Now, going back before that, to the Silver/Gold/Platinum A/B/C models and even older, the 1000-5000 or even older, the Genny 1-5's ? Those things were and still are almost absolutely bulletproof. I've seen fewer of those with rust issues after all these years than I have of the 2007-2016 generations.