I don't find the text in any other book I own to be insufficient, or even noticeably that different from Knuth's books (with the obvious exception of some fly-by-night print-on-demand stuff purchased off Amazon in recent years). It's an assertion in want of proof. TeX might be the greatest example of Yak Shaving in human history: Knuth spent at least 30 years between Volumes 3 and 4 to work on TeX because of dissatisfaction with layout in V3.
This is what I'm talking about. Notice the use of colored blocks and whitespace to break up the flow of the page, to callout different asides and section headers.
https://twitter.com/Sean_McBeth/status/1577388169418383363
Adding whitespace doesn't have to make the book longer. It could just make the book wider. Besides, paper is cheap.
I will be a counterexample: I read all three cover to cover, and seriously attempted every single exercise (although in some cases, "attempted" just meant "actually understand what he's asking, which in itself sometimes took me several days). I didn't skim or jump around at all.
Beautiful formatting here refers to the text, not the whitespace.