MS word also has character styles (like a CSS style on a <span>). IMO you should use instead of bold or italic.
(There are three more types of styles: linked, table and List. See https://office-watch.com/2022/word-five-types-styles/)
But yeah for layout, ie headings and the likes, only ever use the styles, never "bold, bigger bigger bigger". Don't touch the line spacing button, etc etc.
IMO Word could do with a mode where those buttons are simply hidden. Want a bigger, fatter heading? Edit the heading style. There's no other way.
I'm pretty much still on the same setup now, Win11 plus touchscreen. You'll pry my touchscreen out of my cold dead hands. How will I rage-close a "try chrome" popup without a touch screen? You ever try to rage click something with a touchpad? Total non starter.