My point is that people develop attachment to things they own and use, and it's harder to be objective.

Well, obviously. GP used the phrase “compact and pretty”. It’s a bit of a stretch to interpret that as an objective statement. The charitable interpretation is that GP meant it to be subjective.

Edit: I got confused which post you were replying to. My apologies.

This is true of any defense ever made. Doesn’t say anything specific to this argument.