Gary also indicated in the 1E DMG that he considered switching to ascending, but kept the old way because existing players were all used to it.
Page 164: "Because prior game forms worked from a high base number (9) upwards, I have opted to follow the same progression herein for the sake of continuity and familiarity."
Zeno: Achilles, why aren't you using the +2 shield that your fighter found?
Achilles: Don't take Lord Kronan the off-brand Barbarian for a fool! Kronan isn't using that cursed shield. BY KROM, I WILL NOT SULLY MYSELF WITH YOUR DARK MAGICKS, WIZARD!
Zeno: .... uh .... it's a +2 shield. It's not cursed. I ... sorry, McNulty O'Cult identified the shield! It's not cursed. It's a +2 shield.
Achilles: Listen up, O'Cult! I don't need any of your thaumatur... um... thoughtmaturdy... grrrr. KRONAN WILL NOT FALL YOUR EVIL MAGICKS AGAIN! Do you think you can fool me into changing my AC from a 4 to a 6? KROM WILL SMITE YOU FOR YOUR INSOLENCE!!!!
Zeno: Wait, what? ....oh. OH! No, Achilles. It's a +2 shield. That means it is -2 to your AC, not +2.
Achilles: Do you think Kronan is so simple minded? Are you trying to make me a laughing stock with your +2 shield now, or have you been laughing at me this entire time when my +2 longsword has been subtracting two from every beast I have attempted to slay?
Zeno: No! No. O'Cult would never lie. See, a +2 shield is -2, and a +2 sword is ... +2.
Achilles: HO! So the +2 shield is -2 to my saving throws? You wish to eat my charred flesh when the dragon breath turns Kronan into Kronan Nuggets?
Zeno: No, no no. See, it's -2 to AC, but +2 to saving throws.
Achilles: I do not understand your words Wizard. Your words and your maths make no sense! You speak in riddles. Like when you told me that you were level 3, and therefore could not cast a level 3 spell, when we were on level 3 of the dungeon.
Zeno: ....eh, you may have a point.