Funny, I get almost the opposite take. DL is as black and white (and red) as D&D settings come.
DL literally has three mini-pantheons of Good, Evil, and Neutrality, with capital letters. It specifically has orders of Good, Evil, and Neutral wizards, whose magic is drawn from the god-moons that influence Good, Evil, and Neutral magic respectively. Alignment/morality is extraordinarily real, rigid, and sharply delineated in Krynn's cosmology.
But the problems start because a whole lot of DL material treats one's professed allegiance to one of the three moral factions as something that's very often divorced from one's personal actions - and this is true for gods almost as much as mortals. Again, I always come back to the Kingpriest because he's such a standout example. The Kingpriest wasn't acting alone - we're told that the clerics of the Good gods were right alongside him. How does a cleric of Mishakal, the goddess of mercy, reconcile their beliefs with the commandment from the Kingpriest to commit genocide on goblins or punish people en masse for evil thoughts? And this was all in early AD&D where clerics could lose their powers if they displeased their deity, so we can safely assume Mishakal was on-side as well. It's like once someone has signed up to Team Good, they're there for life no matter what they do unless they consciously choose to leave (like Raistlin did when leaving the red robes for the black). There's no obligation to act in a Good manner to stay on Team Good, which makes 'Good' a meaningless concept. You might as well just have Team White, Team Black, and Team Red and abandon the moral dimension completely (and judging from the UA, this is quite possibly pretty similar to what WotC is going to do). And there was a quote earlier in this thread where Fizban was talking about how the Kingpriest was a good man and that the weakness of Good is that it can lead to intolerance. Surely if you succumb to the sort of wildly over-the-top genocidal intolerance we're talking about, you're no longer acting in a good manner? But this doesn't seem to stop Fizban thinking you're good, and the Good gods having their clerics back you up to the hilt. It's as if they're saying that there are certain evils that are inherent to goodness - which I find really hard to take seriously.
Which makes very little sense given the cosmology. If Balance leads to the greatest benefit for the greatest number, why isn't it the goal of the good gods rather than the neutral gods?