It did not really start out like that for players! For most participants, the entry-level knowledge-base requirements in Original or Basic D&D, for instance, can be nil. (It could be so with AD&D as well, but the "Advanced" ethos and special Players Handbook bode against that.) Even for players really into rules, the complexity is low at least at first.Most P&P RPGs - D&D included - have quite involved rules that you have to know in order to play. Each player has to read, for the very least, the whole character creation, skills, feats and combat sections of the PHB (players playing spellcasters have to read even more) at least cursorily, and understand it at least to some degree BEFORE THE VERY FIRST GAME.
For the DM? I would put it right up near or at the top of the complexity scale because the challenge is so much more than just rules-mastery. Adding more rules can cut both ways, saving on demands on judgment at the expense of more need for look-ups. (Which is less intimidating may depend on mental makeup more than on experience, and likewise whether a rough sketch of suggestive background or a lavishly detailed "canned" setting is preferable.)
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