So, I'm curious about this:
You only Loot when you already know there’s something valuable and you’re rooting around to get the most of it. You might Discern Realities to search an ancient laboratory for something useful but you Loot the goblin barracks once you’ve cleared them out, or the corpse of the sell-sword you just put down.
To me, it seems like this restriction is unnecessary, maybe even a little boring. The way the loot move works, it's already entirely up to GM whether there's anything valuable or not. If I loot, the GM tells me about gold and gems, then I roll, and then I might get information or magic. But is seems like there's room to use the move even when there isn't any gold and gems. And magic, as discussed here, isn't necessarily valuable or even safe.
So why not let me loot when I don't know if there is really anything valuable, per se?
Like, we're attacked by a crocodile, and it doesn't have a red cent on it. Why not still let the party search the corpse? Maybe there's the remains of another monster in its gullet, and that tips us off to another threat in the area. Getting that information will take time and/or trouble, and it even opens up the possibility of rolling a miss and getting in real trouble, so it's not like it's ever going to be
uninteresting to loot.*
It also leaves the chance of the GM surprising the party with a little treasure after all: "Actually, yeah, there's few gold coins in its gut, un-corroded by the the stomach acids. It must've eaten someone pretty recently, for those to still be in there ... wonder if there were survivors?"
It feels a little odd for the party to want to search the corpse, but to have to know there's something valuable there already. Maybe there
are coins in its gut? Probably not, but how the hell do we know without searching first? I suppose a Discern Realities roll could be searching, but why not just Loot? That move seems like a better fit for the task.
* Unless, admittedly, I'm just hell-bent on finding some valuables in this crocodile's guts, and the GM tells me, no, nothing valuable there. And then I hit a 10+ and pick that the looting is fast and trouble-free. That would be pretty dull. But there I'm being kind of stupid, really, risking trouble for very little likely reward ... I'm not going to hit a 10+ every time I do that crap.