Don't confuse the lack of a clearly stated baseline from the lack of an actual baseline.
Gygax, et al., probably had some pretty solid assumptions of how the game was supposed to run, at least in some ways. But, they were still pretty new at writing books for such a complex game. The problem with being the first to do something is that you make some mistakes - they probably didn't yet fully understand the value of clearly stated assumptions to someone who didn't learn the game from them.
Heck, I think that value was only really recognized fairly recently. 1e, 2e, early White Wolf, and most other games from the 1980s and much of the 1990s lack clear statements of their baselines.
If a baseline falls in the dungeon, and no one reads it, was it unbalanced?

We can certainly guess that Gygax had ideas about how the game was expected to play out. In fact, given that he himself ran games, he surely did. But were those ideas shared by his fellow designers? I rather doubt it; I suspect every designer at TSR had his or her own concept of how D&D was played.
In any case, since he didn't write those ideas in the books, we can only speculate as to what they were at any given point (they undoubtedly changed over time) and how well the game would or would not work if you followed them. I'm not criticizing Gygax for being a pioneer--as you say, everybody was new to RPGs back then, and it's no shame on Gygax for not spelling out his underlying assumptions. But he didn't spell them out.
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