I generally find the same argument against BUIS and Pistol Night Sights on this forum to be:

"You don't need them because I've never needed them."

Even in the face of those of us that have needed them, the argument continues to be:

"I've never needed them, so your experience is an anomaly."

I find that to be asinine, but I cannot force anyone to do anything, so unless you work with me, it makes no difference to me.

While I did have a Comp M5 break, I have owned 10+ Aimpoint Micros (H1-T2) that have been ultra reliable. Their batteries have not been so, as is to be expected. Batteries can die at any moment, both on your light and your optic. What is your back up plan?

But hey, "I've never needed them, so neither will you." is an argument that I'm sure they won't regret in the dark....