Maybe I just don't get it, but the first example the controls are out of the way, leaving most the space for the content.
In subsequent examples the controls have made less space for content and obscured it. And takes up space with less-often used things like line spacing and and drop caps. Feels like I'm being told that up is down.
And the smudgy liquid glass effect just makes everything look grubby. Not classy.
To me it definitely looks like the area for the document grew. The sidebar is a solution to not tacking a million things into the toolbar, it's not like it's open 100% of the time.