It's interesting how "it's business" has become catch-all for absolving every breach of previously accepted social norm.
As a hiring manager, you're unlikely to be on the clock. And even if, I am somewhat certain that you could come up with good justifications for giving feedback if anybody asks, which nobody will.
It seems to be a specific disease of middle management to feel the need to demonstrate their "professionalism" by going out of their way to deny their humanity. At Wall Street, they buy ugly but expensive clothes for this purpose. But I guess on the West Coast you only have the Gordon Gecko playbook to fall back on.
I used to work at a branding agency, and it was interesting to see how risk averse middle management was: ideas for product names tend to only be good if they evoke some sort of not entirely pure concept. Think of "Plan B", "Virgin", or "CockroachDB". These would always get shot down by middle management as "unprofessional". Go a level up and people are far more open to be human. I don't know if they are just more self-assured and therefore willing to trust their instincts, or if the selection process for higher management actually works quite well.