My 2013 CX-5 is the first car I've bought since 1992 that didn't need a replacement windshield in the first two years. I have off-roaded it extensively with the wheels at full articulation and rocking on two wheels. If the windshield was susceptible to stress fracturing due to frame distortion, I think I would have had a problem by now.
And I have taken a number of loud rock hits at freeway speeds without a crack or even a visible chip.
As far as internet polls, I'm sure they grossly over-estimate the number of "stress" cracks, both because some will report any crack as a "stress" crack and, more importantly, a thread about cracked windshields is bound to attract people who have had a windshield crack in numbers far disproportionate to those who have not and do not find cracked windshields an interesting topic of discussion.
Also, I've talked to three or four other CX-5 owners and, while their usage has not been as extreme as mine, they are all still on their OEM glass as well. I guess I don't see the "issue".
That you've spoken to three or four other owners who have not have any issues doesn't prove that an issue doesn't exist. Mazda sells tens of thousands of CX-5 per year and I'm sure there is a large number of users without cracked windshield. However, there are a few who has this issue. The proper way to evaluate is to determine what percentage of the CX-5 have cracked windshield and compare that to the average percentages of other manufacturers.