I don't think it was an issue of frame warping, so much as it was the fact that some early Kahrs had polymer frames that looked visually warped.
If I recall, those functioned ok.
There weren't any issues that I know of, where someone shot a gun for a while, then it warped.
The pics that I saw would have been visible on inspection.
I had a MK9 that I loved.
500+ rounds, no problems.
It was pleasant to shoot, but I never carried it.
Too heavy.
Traded for a PM9 that has been flawless through 950+ rounds.
It is a little livelier to shoot, but not painful at all.
Both of my daughters love it.
Just as accurate and reliable as the steel gun, but now I frequently have it with me.
I think a lot of "gun failures" can be traced to bad ammo.
When I quit trying to make my handguns shoot Wolf, a lot of problem guns became reliable.
I mainly shoot Win. Whitebox now.
(Still don't have a problem with Wolf in a Bushmaster or Mini 14, just realized that most handguns choke on it.)
So, I guess the short answer to your problem is "No".
Longer answer, "Both are good guns, suitable for different uses."