I usually tear off the sheets before I'm done, so that if I go multiple rounds, my TP is prepped. Usually, that means I tear off 3-4 strips of 2 squares each if it's thick paper, or strips of 3 squares if thin. After going gluten-free, I rarely end up using all the strips, and I'd say about a third the time, I'm done after using my first two squares of it, so the rest is wasted.
You can think that you've won the poo lottery by pinching one off that seems to wipe clean, but no one is going to recommend sticking that paper back on the roll or putting it in their pocket to wipe their child's face with later just because they don't see anything on it. That's absurdity, and anyone arguing otherwise knows they wouldn't do the same because they don't actually believe it's clean.
That "clean" paper has enough on it to inoculate a fecal assay, and for some people, that's enough to cause issues. There's also the case of it wiping clean but not being completely cleared yet. Not everyone needs maintenance wipes, so not everyone even knows or understands how unreliable wiping as an indicator is.
The mods of HN are suffering from wipe privilege, and it needs to be addressed.