Emerikol
Legend
I don't ask this to be confrontational, but how much of 1e/2e did you play? For me 3e was the hugest, most ginormous change in my role playing experience. It was the first time that the game had a more or less unified rule set. In the old days, joining a new campaign was really tricky because, in my experience, each group ignored a large part of the rules that your previous game didn't, and emphasized rules that your previous group ignored. And there were always tons of house rules.
Try firing into melee using 1e rules: "Assign probabilities to each participant" (you've already lost me, Gary.) Half-value for s, 1.5 for L, "Total the values for each group and ratio one over the other." ..."Thus, 4/7=56pc or 60pc chance per missile..." (1e DMG pg63)
Did you know that the first time you listened at a door you may "keen-eared"? Neither did I.
Edit: Even with grognard nostalgia, I have not heard a call to start using "segments." Or, my personal favorite, the randomly generated prostitute table. The distinction among Sly Procuresses, Saucy Tarts, and Haughty Courtesans can be game changing.
I've been playing since the red box. I DM'd 1e.
A lot of the stuff there at the end of your post is fluff and not really systemic.
The firing into melee is clear to me? Assign weighted chances by size. I would probably assign 1 to small, 2 to medium, and 3 to large to keep it simple. I may think this is a lot of effort for what it gets me. But this kind of stuff is corner cases. I'm talking the basic structure of the game.
I agree that 3e was cleaned up math and standardized. It added feats and skills. That was additive. If you take away feats and skills, you have essentially the same game. It would look like a retroclone instead of 1e because of the math cleanup.
Sure in 1e there were lots of niggly rules and DMs tended to take them or leave them. That hopefully is very 5e and I'm for it. I don't consider that that big a change compared to what 4e did. It still looked like D&D to me. I do dislike that 3e got rules heavy and would prefer something rules lighter with more DM empowerment but thats me. I don't want 4e because I don't like it but even if I liked it I wouldn't think I was playing D&D if I didn't look at the name no the cover. I guarantee Gygax would have sued the pants off 3e if someone else had released it during the 1e era. He would have looked at 4e and shrugged and went on.