Dessert Nomad
Adventurer
I think it is less about consensus and more about how some people either don't remember or didn't play with the rules -- house rules were the norm, not the exception during that period of time. I don't think I ever played in a group that played entirely RAW. It could also be a matter of tactics and group size (see below).
I say it's about consensus because the initiative rules are spread out, complicated, and highly non-intuitive, It wasn't just that people chose to play with house rules, people often didn't even know what the real rules were before they came up with house rules. And as I understand it, even Gary Gygax didn't actually use the official system himself. This PDF is (probably) accurate, but if you look at it it takes an incredible ten pages to explain how initiative works, and how the D6s people rolled are often completely irrelevant. http://knights-n-knaves.com/dmprata/ADDICT.pdf
I am glad that this prompted me to find that document, but the correct initiative rules are actually even more confusing than I remember!