“……As far as the original premise that Hashem only brings a nisayon that a person can handle, I heard that Ramban in Shaar Hagemul disagrees or limits this to specific situations….”
Would be interesting to see that Ramban, but here are parts from Chofetz Chaim’s sefer “Binsivos Hatfilah”…. p. 55, under ‘Laamod B’nisayon & ‘Suffering Yesurim ‘..
…..We say the prayer of Al Tevi’einu Lidei Nisayon each morning , because we may not have the power/strength to withstand the nisayon…
…….From Midrah Tehillim, There were those who who prayed for yesurim , and those who said, Lo Hein V’Lo Secharan because they were afraid they wouldn’t be able to withstand nisyonos… End of Chofetz Chaim’s words… Obviously, not everybody can handle a nisayon..
We also know that David Hamelech asked Hashem to give him a nisayon, but he failed it.
What’s not clear to me is this : Are there degrees of nisyonos, is every tzara ch”v or catastrophic event a nisayon,
or something else? A gezeira of some kind maybe, an onesh??
For example, an enticement to do an aveirah of say, theft, eating non-kosher food, arayos, etc. can arguably be considered a nisayon, and the person will undergo an inner struggle not to cave in…
But is this the same as being slammed with frightening traumas in life, physical & mental, that are more severe and have damaged lives as a result, as I have presented in my first post above, or even as some others have commented here… It is to this type of nisayon , if that’s what it is , that I believe the OP alluded,
and which is a strong question.