I use this AutoHotkey oneliner. WIN+Space pins/unpins the current window.

    #SPACE:: Winset, Alwaysontop, , A

(Save to set-always-on-top.ahk, and create a shortcut to the script in %userprofile%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup. Optionally add #NoTrayIcon at the top of the script to get rid of the tray icon.)

Yeah AHK can fix a lot of this, but I only really use Windows on my employer's computer and they're very much averse to installing anything to help with QoL issues like this.

Surprisingly, there’s no way to keep an app on top on macOS!