If the chainstays are 425mm long, widening their spread from 126 to 130mm only changes the dropout angle by a bit over a quarter of a degree. I can easily imagine that small tilt being totally insignificant -- as it has been in my experience.
What are you even talking about? I never said dropouts could not be spread to 130mm. Nothing explodes.
I’ve cold set steel frames before. But that doesn’t mean it is possible to just shove, not cold set, a 130mm hub into any 126mm dropout frame and it will be fine.
And I’ve had to square the dropouts on a frame that was spread because they flared out. Not a big deal.
You do realize that if the dropouts flare so does the hanger?
John