Do you mean non intuitive or just not the same as PS. 99% of complaints I see about GUIs (most commonly OSS ones, because people are less likely to criticise choices where they invested money) are that they do not function like another piece of software.
> For example in Krita you can't resize a crop rectangle with the mouse that holds its aspect ratio... WHYYY? And why does the crop tool forgets the previous size values? Little things like these show that the creators NEVER EVER use their own fucking program.
Are you sure? IIRC you just hold down the ctrl key while dragging to preserve aspect. Do I remember wrong?