Lanefan
Victoria Rules
The comcept of touch attacks has informally been around since forever e.g. trying to touch an unwilling recipient with a 'touch' range spell, or any attack from an incorporeal undead. All 3e did was codify some rules around them; one of its better ideas.3E made big changes too - eg changing saving throws from a metagame, "fortune in the middle" mechanic where fighters (at all levels in B/X; from mid-levels in AD&D) were strong, into a simulationist mechanic where fighters were weak.
Another couple of examples: doubling down on simulationist grappling rules, and adopting simulationist "touch attack" rules, that completely changed the way a whole heap of monsters and spells played.
As for saving throws, the "fortune in the middle" bit didn't change, just the numbers and means of arriving at said numbers; and the numbers change is what hosed the high-level warrior types.
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