You were comparing a single attack in D&D 5e--not an entire combat--to a Spout Lore move. Perhaps you were replying to someone else who was. Either way, it's not an accurate comparison, because a single attack in D&D 5e is vanishingly unlikely to carry the same weight as a Spout Lore move in a PbtA game.It is. The distinction of a contest is poorly posed. It's a complex, meaning many step, resolution process to reach a conclusion to the initial question posed. In the case of combat, this is simple - do we survive this encounter. In the case of the example of spout lore, or really any instantiation of spout lore, it's part of the extended process of play that's just as complex as combat. Blades has a useful construct here in the idea of the score. While Blades doesn't have a spout lore move, the idea that a score is a complex resolution process to answer a question, like combat, is there and we can imagine something like spout lore taking part in that process. This correctly cites spout lore not as an independent bit, but more akin to an individual round in combat were you progress or do not progress towards your end goal.
I think your comparison between a Score in Blades and a combat if D&D 5e is more relevant--both because they're both complex things, and because Scores are at the heart of Blades in the Dark in the same way that combat is at the heart of D&D 5e.
My point is that comparing a single attack in D&D 5e--which is what you did--to a PbtA move is not a useful comparison as anything other than a rhetorical maneuver. This is precisely because, as you say, combat is so zoomed-in, in D& 5e.The distinction you're drawing is more one of habituation -- combat is a place in D&D (and similar games) were the resolution of play zooms in and you have strong system say in that resolution (after the GM has blessed it, of course). The rest of play does not have this focus or strong system say and is quite often dealt with in a simple process of a single check. In this framework, combat feels different because of that zoom and strong system say. It's not actually different, though, outside of this. And spout lore really needs to be situated in the larger play. Arguably, this applies to 5e as well, in that a pick locks check isn't isolated either but is, in fact, part of a larger resolution process to answer a larger question. It's really that sudden zoom to a tighter pixel count in combat that makes it seem different.
Compare the Spout Lore move to any sort of know-whats check in D&D 5e, and you're probably making a fairer comparison. I'd be happy to discuss that comparison. I won't be discussing unlike comparisons further.