For minimize I can't say. But the maximize works the way it works because (and this is according to the platform ideology, not some general truth) you are not supposed to maximize windows in the Windows sense of the word.

The macOS interface is based around floating and overlapping windows. If you put a window over the whole screen then it could be as well maximized. This gets a bit hairy on smaller screens but really shines on huge monitors. In general macOS is more optimized around having one big screen rather than a multi-monitor setup.