nomander: I am talking about cRPGs. Manuals were often "tomes" of lengthy reading on the extent of the games systems and features.
Pen and paper, naturally there were two basic crowds. The statistic players (or min/maxers) and the "role players" as you stated. I was in the former. I preferred more of a the "game" aspect over the "story/immersion" concept of play. Don't get me wrong, I respect those who liked that sort of thing, but for most of my friends, it wasn't the interest. We liked getting down and dirty in the rules, arguing for hours over various technicalities of play (world physics, combat mechanics,, etc...).
InEffect: tbh I never understood why people just assume power-gamers/min-maxers/statistic players, whatever you call it, can't RP. As if crippling deficiencies in character development somehow make you a better RP-er.
It is a matter of what the focus of play is. I have played with both, I prefer to play with statistical players as the "role players" I have played with tended to completely disregard the rules and systems claiming that freedom of expression was far more important than the "game" aspect. The result was often more of a LARPing session than an actual game. I had a friend who played Vampire in the early days. The extent of "game play" was that of doing "ro sham bo" to resovle conflicts while the rest of the session was play acting their characters. To each their own, but imo that is less of a game and more of just a themed drama club.
I have also had some "role play" types play with my statistical friends and they objected to being held to the rules. For instance they got angry that the DM drowned their character because they jumped off a ship into the bay in fullplate armor. The claimed the rules were irrelevant and that the point of AD&D was to experience the interaction of roles, not lament over "stupid restricting rule systems".
So both sides certainly are capable of playing to the theme of the other (I knew some who played a paladin to the complete letter of the system without straying and did so while never breaking out of character, even when we took a break from play to grab a bite to eat).
For me personally, I dislike the play acting, it isn't my thing. I speak in 3rd person consistently in play and the game is treated more as a statistical board game with a story of interaction. I don't play with the non-statistical players who think rule systems get in the way of play and I certainly don't agree that a cRPG is a game of such nature, being that a cRPG is much closer to that of a board game in its concept than that of a role interqaction game (which as I said, adventure games seem to be closer to in nature). If you look to most cRPGs, they are very rule centric, very focused on the systems, the combat, etc.... and I think we can safely say that Pathfinder leans more to the "rules" focused game of AD&D than most versions of AD&D.