This kind of "nitpicking meta bullshit" is valuable feedback to someone, like a startup, who might be marketing a product and hoping to not turn away customers. Sure, this particular thing isn't selling a product, but how many people would be turned away if it was?
Like you said: "this particular thing" isn't selling a product. "This particular thing" didn't ask for this feedback, doesn't need it, and may very well never see it. The fact that there are a few rare exceptions where this kind of discussion is helpful doesn't change the fact that, 90% of the time, it's a low-quality, useless waste of time.
