I just looked at the 1E PHB and DMG.
I can find no explanation for the weapon tables. They are just there.
Ok, there is a little explanation in the DMG for one PHB table that "armor" in the weapon vs armor table is about armor worn and not final AC. But otherwise, they are just these sort of immaculate tables, appearing out of no where.
Page 66 has all the speed stuff in the DMG like I said cool in some ways painful in others
I don't know if you have looked at or used the table on page 271 of the DMG. It's not as robust as the 2e version, but it scratched the itch for me. IN my group we don't use the initiative system exactly as described in the section, but we use the speed factor adjustments.The only thing I miss are the speed factors. A long sword is faster to swing than a two handed sword. That same long sword is slower that the short sword etc...
I was recently reminded of the fact that, in 1E and 2E, weapons did different amounts of damage based on whether the target was Medium or smaller, vs. Large or larger.
Does anyone happen to know/recall why that was done? I'm interested on whether Gygax et al. ever gave solid reasons for it--both on a mechanical level and on an "in world" level. I don't remember seeing any such reasons myself, but my knowledge of older editions isn't encyclopedic.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.