I can definitively say that some 16 Pro Max do not have this issue. Mine never misses a touch input, ever, even when I try holding my other finger all along the edges of the phone, etc. So… seems like it’s worth investigating if there is a correlation to something, because “just software” doesn’t explain that at all.
And like I said before, my launch 15 Pro Maxes had a glitchy touchscreen issue out of the box that never went away through the entire ios17 and 18 cycle, and later units didn’t have that issue. So I strongly suggest that if you’re still in your return window, you keep returning your phone until you get one that works, because Apple will never fix it if it’s a hardware issue unless they do a full recall