I don’t know why people would gripe. There’s a bunch of different ways to resize windows in macOS. You can fullscreen them into their own virtual desktop, and sure, unless you drag another app alongside then no, that’s not compatible with other windows at the same time. Personally, I use fullscreen for apps that I don’t need to interact, or that I want to have full focus on. iTunes/Music for example, is kept to the far right of the spaces on my right hand monitor. I know where it is and it’s easy to access without taking up space on the desktop.

But you can also make them fill the regular desktop by double clicking the bar at the top of the window. Or you can drag windows to various sides of the screen to resize them, the same way you can with Linux and Windows.

And yeah, there’s Stage Manager too, but honestly, I’ve never really seen the point. Not on a Mac anyway.