I was at a pistol class a few months back along with a very small (100 lbs wet type) of older lady (I won't comment on what "older" means). She had a Beretta 92FS that her husband said was THE gun she needed.
She couldn't rack the slide. He let her try a Glock 19...still couldn't rack it. Finally she could rack a Ruger Mark III .22LR.
He told her to get rid of the 92FS, as iff she ever got into a confrontation, it will eventually be taken from her and used against her.
She argued and stood by her husband's recommendation of keeping the 92FS.
The instructor would not PASS her. He told her to come back when she could demonstrate safe and sufficient operation of the firearm that she would be using...the 92FS.
To me, I think he did the right thing. He wanted to make sure his "graduates" left with what he felt was at least the "basics".
It is not like he was asking her to get 8/10 9's at 10 yards or more.