Part of carrying is being prepared and making the good decisions. There is what is right and there is real life. In a perfect world they should coincide. Many defense attorneys agree, if the gun you used is the one you qualified with it is one less thing for the prosecutor to use against you.
I get it, "It shouldnt matter! There is nothing in the law that says I can't use another gun" and I wholeheartedly agree. But in the spirit of covering your bases and looking out for all angles of attack while going about your life, the same could be said about legally, are you making the prosecutors job easier or harder to convince a jury (that is ignorant of firearms) of your guilt? If you want to be that test case, no one is stopping you, and you could walk away unscathed, if its worth the risk to you, then live your life, carry how you like.
So for me, I will only carry what I qualified with. Because after seeing the Rittenhouse trial and seeing the bullshit the prosecutor will fling at you, itll be one less thing to worry about. It also helps I qualified with three guns, so I have options, lol