Well this is a cat site and cat does not need a chassis stiffening kit to make it survive hard riders. But to each there own.Since 2005, I have owned 6 Ski-Doos put over 6,000 miles on each with ZERO chassis problems.
At my seasonal rental, there are 20 guys, and years ago it was an even mix of all brands (Cat, Polaris, Ski-Doo, and Yamaha). And now there are 19 Ski-Doo owners and 1 Arctic Cat owner (which belongs to the guy who is a retired Arctic Cat employee). Anyway, of the 19 guys who have owned multiple Revs, XP/XS, and G4 models no one has really had an issue except one guy with a 2004 REV Renegade with over 14,000 HARD miles on the sled, one of the front skid chassis mounting holes was out of round which was easily fixed. He went onto replace that sled with a Ski-Doo XP and later a Ski-Doo XS.
But no, no, you are right, Arctic Cat's superior design, engineering, and quality have led them to the coveted # 3 market position and nearly zero inventory available to non-Spring order customers. Their strategy is far superior to Ski-Doo's .... what was Ski-Doo thinking with their total lack of innovation and quality that led to terrible sales and market share.