I certainly believe in the science of ballistics but I test ammo for function and POI not what it might do in a block of jelly. My preference is JHP for obvious reasons but its simply a box for me to check. If its a JHP and will function reliably in my weapon and seemingly flies straight, I check the box. Although one projectile might be a better performer than another, I am simply not inclined to go through the paces to measure the fine details. A fast moving projectile will put holes in things and if it goes where I point it and at least has a good chance ( based on its JHP design) of staying there, I am not really concerned beyond that. If a JHP will not run reliably in my gun, I will opt for a FMJ and not do any handwringing over it.
I accept that some people are numbers people, fine detail or nuances people.. there is nothing wrong with that. Thats not me though, I essentially want the thing to go bang and come out the other end in a straight line. I consider everything else to be up to me.
So yes, I do agree that you should test your ammo. I am simply not motivated to the same degree or for the same reasons as most others. I am certainly not suggesting that others are wrong, just different. I am often in the minority in the way I feel about gun related issues.