It’s funny. Complete opposite for me. I had never heard about doing less than three passes before the internet. All my life before then it simply hadn’t occurred to me that I could omit shaving against-the-grain.Very interesting indeed. I only heard of the three pass shave on the internet. I just assumed it would logically provide the closest shave with the least amount of irritation. I have done 3 in the past but generally only do 2 passes: with and against. When I started shaving, before the internet was invented, I only did one. You appear to have a clean shave, but it doesn't feel that close. As long as you appeared to have shaved the military was satisfied. I remember having to dry shave in the field. It was pretty terrible. Luckily, my beard wasn't as thick then as it is now.
I suppose people have always shaved differently - some with three passes and some with less. The internet has just exposed us to viewpoints that differ from whatever we were taught to do, but all these different methods always existed.