Not a lawyer, but for the last 20+ years I've dragged around (or recreated) a normal.dot file that has all the styles I use with the keybindings I like.

The productivity boost you get from having a consistent environment is insane. You never need to care about the ribbon, your documents look good, and your mouse/keyboard ergonomics are wonderful with a good normal.dot.

It's like people who have their vimrc or emacs config down to a fine art.