I'm a photographer yeah. Not expert on lenses by any means. But I know how a cheap reflex lens full open performs. Not sharply.
I think the biggest issue for 13 Pro is the AI/software that tries working it’s best for the photo situations.
As you stated above close ups are showing the issue more. The software seems to combine lenses to get the photos. You can’t choose only the 0,5x and get the same result as the cameras auto-macro mode.
I don’t think it’s the hardware for these issues.