Just because someone found that the 6 Plus can bend (if you try really hard) and has bent in some specific cases, does not make it an "issue." Any large metal framed phone, if you try hard enough or wear tight enough pants or sit on it enough times, will bend.
Why do you state your opinion as if it was fact? I don;t feel there is an issue with the inherent strength, but every failure is in the same place, below the volume buttons. The phone is flexing, as any will do, but that one weak point is where it bends, and that is a design failure. A poster here has a 6, his got a hairline crack in that same place. That weak point can move, in and out in and out, and while its a fraction of a mm p[robably, its constant movement, which further weakens that point.
Today's iOS 8.0.1 update is an "issue" because it's clearly a fault that broke two very basic device functions and affects a wide cross-section of people who installed it. "Bendgate" is perfectly preventable with a little bit of common sense and awareness, and not the product of some flawed design.