science is extrememly useful in the areas it can be applied. its scope is quite narrow and thats exactly why progress in science is possible. same thing with mathematics. But scientism is absurd.
What alternative would you apply? And who gets to decide where science applies and where it doesn't? You? The village shaman? Some "holy book"? Whose?
"Areas [science] can be applied" consists of everything with a physical basis, which so far has proven to be every verifiable thing we have ever examined in the universe throughout history. All philosophical attempts to support some kind of dualism have utterly failed. Everything we've learned that has any real-world applications can be boiled down to scientific examination. It is the single best tool we've ever developed for expanding our knowledge since the development of language.
Homo sapiens has existed for roughly 2000 centuries. For the first 1,995, we managed to stumble upon a few scientific discoveries, almost by accident... mostly in agricultural and large-scale mechanical fields. We learned to grow stuff and build stuff during that time, and that was just about the whole of human progress for the first 99+% of our existence. It is only after the scientific method was codified that our knowledge base started growing exponentially, and our last five centuries have seen more progress than all the rest combined.
Behaviorial study is a fairly young field. Like many nascent sciences, it is still little understood, so early efforts will necessarily involve qualitative data. Our knowledge of something as vital to modern society as electricity underwent a number of false starts before it was understood. If your attitude had prevailed then, we would have never gained enough base data to turn it from a mere curiosity into the useful tool that it is now. You would have said, "Electrical fluid? Pfft, you're trying to quantify something that is qualitative and redefine 'electricity' away from our intuitive understanding!" We'd still be burning candles for light and performing the majority of menial tasks by hand. (That model turned out to be wrong of course, but it inspired a lot of the work that pointed us in the right direction.)
I challenge you to list even one field with real world application where significant progress was made without science. You are right about one thing; there is a lot of absurdity in this thread. But none of it stems from "scientism." It originates from a Luddite viewpoint that incuriously wants to artificially constrain what science can and can't examine.

Ok, I'm being silly, but the point is there will be fool proof fail safes. People have a fundamental interest in maintaining our place as the dominant beings on the planet.
Most of our qualitative assessments are quantified BTW.
Well, yes, but that's more like a statement about people, e.g., people want to make everything into a number. Want to, that doesn't mean they always do it very well. Of course someone would want to quantify intelligence, because that sounds fun and would make things a lot simpler. Doesn't mean they wholly succeed in such a difficult task.