Because it makes you have to think before moving. If I am on Chrome and want to go to my code editor, I have to press CMD+Tab, see what position the code editor is in and press CMD+Tab x times to go there.

If I uses spaces, I know exactly where my editor is, where my browser is, it is one key press away and it is always there. I use aerospace and I divide my spaces using Alt+ the qwerty keys. Q=chrome W=code editor E&R=programs open for what I am working aka Postman or Obsidian and T=MS Teams.

My dock on MacOS is always hidden because I don't need it and now I have more screen realestate.