[Aside, I am breaking my vow of posting after the second page in a thread. I firmly believe anything after page 2 of a thread is either worthless or off topic. In this case, I think it is both. But, its Friday, so what the heck]
I think I have hit a few nerves in here about this issue, with good reason. I'm challenging a principle that a lot of you have held firm to for a very long time. A long held opinion about something doesn't just change overnight.
Here's the skinny - Principle is the key word here. Its irrelevant. If you play 1e of any length of time you will either (1) houserule it to your liking or (2) find another game (and many of us did both)
This reason is exactly what you have been saying. In places, 1e is a very set "this is the number," especially in places like the thieve's skills. In other places, its bad (grappling rules - if you play those by the books...well, I'll be nice and not comment). In others, its just plain not there (disarming, and why all the stuff about attaching limbs for trolls when you cannot cut off a limb in combat?).
As soon as the thief comes across a deaf, dumb, and blind kid (who sure plays a mean pinball) the player is going to lobby for a bonus. If you grant it (as most would), then you have deviated off your principle. If you don't, then you eventually lose players.
We all had a notebook of houserules. I still remember our group eventually split HPs into "Meat" and Endurance and adjusted the rate of recovery because none of us wanted to play the Cleric (healbot). The problem is everyone had different house rules depending on what the players got into in the game. If someone liked thieves, you bet there was some rules modifying those percentages to do stuff. If your group was into combat, how things get chopped up got some special rules.
3e merely created a set of agreed upon house rules. I had about 3 minor house rules under 3.x - I just did not need them.
Thus, the "freewheeling" does not come from what is on the page, it comes from that fact in 1e the DM had to adjudicate more, and DMs all adjudicate differently. In 3e and 4e, there is a much higher probabilty of getting the same resolution (what to roll, DC, etc) than under 1e. Just read the modules - trap resolution were notorious in the varied mechanics, sometimes in the same module.