One of the things 1E did really well, especially in the early years (late 70s and early 80s) was adventures. The hardcovers were very limited
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What feels like bloat are countless monster supplements and feat/class option books - stuff that can easily be incorporated into Basic and online without needing tons of supplements.
The problem is, we have basically a binary scenario here, I think:
1) WotC-enforced no-bloat: WotC refuses to publish any game mechanic material in Dragon, and only produces a handful, tops, of books containing any mechanics over the entire lifespan of the edition (i.e. 1E model, no?)
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2) WotC produces stuff some people will insist is "bloat" - Dragon has mechanics sometimes, books come out fairly regularly with mechanics in them.
As someone who actually played 1st ed AD&D, these posts do not paint an accuate picture of the "1E model".
I had hand-written lists/indexes of monsters (2 MMs plus FF, OA, GA and DA, plus monsters spread across modules, Dragon and White Dwarf magazines, and maybe other sources as well that I'm forgetting), of spells (PHB, DMG notes, UA, DA, GA, OA, modules, magazines), and of items (DMG, UA, DA, GA, OA, modules, magazines).
Then there were the various rules subsystems from Dragon magazines (eg the XP rules for non-combat XP in Dragon 99 (?))
Then thereclass notes and variations (eg the monks and bard from Dragon, two versions of a clerical conversion ability (one in Dragon 94 (?), one in White Dwarf), etc).
Whether or not that counts as "bloat", it was not a trivial issue from the indexing point of view.
I honestly wonder how many people bought Divine Power 2.
Zero? (Unless you know something I don't.)