Of course. The upside of scouting is to mitigate the downsides of engagements. Less lives, time, and materiel lost.
And much as the optimal outcome would be "no engagements at all", that's frankly not up to Mathilde, whether she scouts or not.
See, this is what gets me. We can't logically puzzle out ahead of time whether the Iron Wolves will attack or not. That's (Edit:
often) going to be determined by the dice. The logical in-universe explanation comes later. And yes, if they do try to ambush us then the Knights of Taal's Fury probably get the opportunity to counter it. But how successful or not they will be is, again, up to the dice.
I want Mathilde to scout the Iron Wolves because it gives her the chance to weigh in on those dice. This is her area of expertise, she's done this kind of offensive scouting again and again. She's got the traits and experience to blunt those dice by quite a bit. And yes, this does mean loosing out on another social action. But much as I like social actions myself, here they're competing against "do your job" actions. Actions that might improve the survival of the entire expedition. I think that we're going to have to keep deciding between social actions and non-social actions more and more as we keep going, and we're well past the point where we were completely safe to engage in social actions.
Last turn we visited both Uzkulak and the Seventh-and-Final-Combe. Our visit to the former successfully got us more supplies and intel on a possibly nearly Ogre tribe. Our visit to the latter didn't get us expedition-relevant loot, and the intel on what may have happened to the Plotter-Daemons wasn't particularly relevant. But if the dice had fallen differently, these results might have been reversed: Uzkulak might have been entirely without food for sale, and the Combe might have had intel on an imminent attack. We can't know ahead of time what Mathilde will find by poking her head into the unknown. Only that she'll find
something.
I am trying to imagine the rep gains for bringing back the dwarfen Ancestor God(s) and failing. It would make what Sigmar did seem like a joke by comparison. Then again if we had actually rescued them they would be quite capable of paying us back themselves.
Even just one would be such a huge deal.
[] The Sally Port of Gazul
In my headcanon, this doesn't summon some kind of ghostly army. This summons Gazul, and only Gazul.