I read that Apple follows a document model, where the application is kinda a background thing a window is supposed to be for a specific task. Not like Windows where the main windows is the hub of interaction. So you use CMD + <backquote> to switch between these tasks and CMD + TAB for switching between applications. The menu bar is part of the application, but windows can modify it to suit the focused tasks.
I've used Rectangle for quick window management, but in time I've come to understand the philosophy so it does not bother me as much. It's more leaned into the desktop analogy than other OS.
The desktop represents the active app, and a window is the active document in that app.
This doesn't make all that much sense with today's screen sizes and multiplatform apps.
My earliest exposure to computers was a Mac (though Windows, Linux, and BeOS also came into the picture fairly early on) and I don’t find the Mac model the least bit problematic. On the contrary, I find the Win9X model overly simplistic and unmanageable past a small handful of windows.
For window snapping, there are countless apps that will easy solve your problem. But I get why you would struggle - I still get frustrated at times with the way MacOS works.
Just download Rectangle for free. I recently switched from Dell XPS to M3 Pro and that was my gripe to. One install and it's much better, moving windows with ctrl+opt+arrows is also close to Windows and makes it fairly usable.
I have to use macbooks at work, and they do bother me. The mirror-finish screen always reflects bright lights into my eyes, be it a window or a ceiling light at a distance. The OS is thankfully a certified Unix, but the GUI, while having a few brilliant features, also has warts like no way to align or snap windows, apps running without a window, with only a menu bar, with a window from a different app showing, etc. This continues for many years, so it's likely a design principle.
Of course, Windows is even worse in the GUI department, there's no comparison.
So, sadly, a Macbook remains the most sane computer for non-technical people :(