Exactly, you need a third-party tool for better management via snapping and sensible hotkeys.
Windows, Gnome, KDE, etc. have all these things for years. Perhaps even over a decade by now?
Microsoft even go one further with Fancy Zones in their PowerToys pack which is fantastic on very large/wide monitors.
I wish Apple would add the functionality of apps like Rectangle/Magnet/Fancy Zones with some additional options such as layouts. That would be far more useful than whatever they were trying to achieve with Stage Manager on macOS.
