I think Rectangle is the spiritual successor to Spectacle.
That developer has some really cool apps. Just switched to macOS from Windows and already discovered there’s no way to mimic middle click on the touchpad. This person has an app for that!
Wow, now that you mention it this person does have some cool apps. For example, Hookshot (https://hookshot.app) does snapping with your cursor anywhere on an app.
I found that once I got used to the keyboard shortcuts, my window management on macOS became second nature.
https://www.spectacleapp.com/