LeeRoth wrote on 08/26/17 at 13:57:48:
But, to answer your question, I mainly meant it in a categorical sense. In my view, the KID belongs to the category of the hardest and least solid 1.d4 defenses to play because, unlike defenses where Black occupies the center with pawns (QGD) or tries to control the center with pieces (Nimzo), in the KID, Black surrenders the center.
Perhaps I should mention that my main defence to 1.d4 has at various points been the Chigorin, the English Defence and the Leningrad Dutch!

Maybe defences like that aren't even on your radar, but you can understand why the KID doesn't feel
that risky to me. Especially if Black avoids the Mar del Plata and chooses something comparatively solid like 6...e5!? against the 4PA and the Byrne system against the Sämisch.
LeeRoth wrote on 08/26/17 at 13:57:48:
On top of that, even among that third-category of 1.d4 defenses, I think of the KID as being the opposite of a "solid, low theory" opening. The opening has to be more about the first couple of moves. I frankly do not understand your comment that an opening can be "solid" if it leads to "strategically marginal or dubious" middlegame positions. The KID can lead to very complicated structures where the pawn breaks are difficult to see and calculate.
My point was that there's an objective sense of "solid" (or really several, as per ReneDescartes' list below) and then there's a sense that depends on the level of the players. With the KID you're likely to survive the opening, get castled and not face an immediate attack on the king or tactical chaos. On, say, 1800 level, even if some middlegame positions are
objectively risky, just a bit more understanding of and experience with those typical structures can nullify any objective strategic/long-term problems.
LeeRoth wrote on 08/26/17 at 13:57:48:
But if you're going to pick a 1.d4 defense, I think you need to consider its overall character, since you can't always count on getting the particular lines you want.
Good point. I often spend quite a bit of time trying to predict which line(s) will appear against a particular opponent. But this is nowhere near foolproof, which is why being able and ready to play many different kinds of positions is important. Ideally I want to have a varied repertoire for different situations, but I always find myself drawn to openings that tend to be on the sharp/unbalanced side but not completely tactical and irrational.