1e had plenty of rules, but the rules in 1e were the provence of the DM, who decided what got used, what got ignored, and under what circumstances any rule would apply. As has been pointed out more often than rabbits mate, almost no one played AD&D 1e by the RAW. As the RAW contradicted itself, this was possibly impossible. No player could know the rules in play in any given encounter, even if he memorized the DMG, which de-emphasized the rules from the players' perspective. Although 1e had a lot of rules, it didn't play or feel like it had a lot of rules.