Some people (well, me at least) like the air purifier to make some white noise. Mine doesn't turn on automatically if, for example, the power cuts out and then comes on again, and I always notice it within a few minutes because the house feels weird without any background noise.
I always love it with someone proclaims that my benefit / enjoyment of something is invalid because Science declared it so. This isn’t even how academics talk about things like this.
Of course, individuals may find white noise personally irritating or distracting, and continuous loud noise of any sort is bad. But for others, noise can also help with relaxation, concentration, and sound masking. (I personally find white noise irritating, but I like brown noise.)
