Most popular nonfiction books these days contain very little information, should be about a dozen pages long, and can indeed be mostly skipped.
There is a good art to skimming and carefully selecting books that get your full attention, there is a lot of garbage out there.
If you only have, say, 20 minutes with a book, you can get a lot out of it.
This does offend people who really like books who read most of their books every word. Lots of books don’t deserve that and you’ll get more out of books if you realize that.
And yes you can absorb a lot of a topic by only spending a short time with many books.
But still, some books do deserve to be read word for word, others studied for years.