Someone's artwork _should_ be possible to (negatively) criticise. Of course, just saying "it sucks" is not constructive or helpful.

You can definitely hurt someone's feeling with unconstructive criticism of thier art. However, pointing out areas to improve should not be too painful to the artist, as they can make newer, better works.

I suppose a difficuly can arise if people get too attached to things they make (art, code, writing, whatever) and don't see any one thing as just a step on the road to even better things.

I think my roundabout point is that companies, code, policies, etc aren't just "things without emotions that can't be offended" because they're all made (or maintained) by people (like art).

I agree with all your points.