I agree that macOS has become worse, however your examples don't really count:
replyWindow snapping was implemented some time ago: https://www.macrumors.com/2024/06/12/macos-sequoia-window-ti...
Instead of win key, you can press F3, or just set a hotkey that works for you in the System Preferences
Instead of clicking the red maximize button, you can double-click the window header / title. This will use an algorithm to try to resize the window to the best size for its content.
Maximize is green. (Any chance you might be color blind?)
replyOption-click green button does window maximise (normal click does full-screen)
replyYou can also hold ALT and press the green button to mazimze.
replyThe app still gets to decide though! Most programs do go full size with an alt+green click, but not all. A column-style Finder window, for example, seems to go taller but no wider.
replymacOS gained window snapping last year, and you can bind some keyboard shortcut to the “exposé” view (which is triggered by a trackpad gesture by default)
replyfull screen is still its own thing as you mention, though