Earlier quoted context omitted.
Depending on how you've configured your Dock, Minimize is pretty simple. Either the window just moves to the Dock, or it minimizes into the application icon (then you can right-click on the Dock icon to view a list of the windows that are minimized, or click to open the last minimized window) Maximize on Mac was NOT designed for the window to fill the whole screen, but rather to resize the window to optimally display…
> Maximize on Mac was NOT designed for the window to fill the whole screen, but rather to resize the window to optimally display its contents. The problem with this approach is I definitely do not need someone else making the decision of what is "optimal" for me. I've been using macOS for about as long as I used to use Windows now, and at this point, macOS seems to have largely abandoned the concept, which is great.…
The reason this is done is of course that most applications don't have content that fill the entire screen, so maximizing, in most cases, is meaningless - and hinders the usability of the system.
It makes more sense to leave some space over for other apps than have a big empty area on both sides of the screen.
Interestingly, I noticed that it's only Windows-switchers who complain about this. People who've used Mac for a long time don't give this any thought.