Text whose primary goal is conveying information (as opposed to emotion, experience or aesthetics) should be skimming friendly. Time is expensive, words are cheap. Skimming is a vital mode of engaging with text, either to evaluate whether it deserves a deeper read or to extract just the information you need. As a reader, you should nurture your skimming skills. As a writer, you should treat skimmers as a legitimate and important part of your target audience. Among other things it means:
Good title and TLDR/abstract
Clear and useful division into sections
Putting the high-level picture and conclusions first, the technicalities and detailed arguments later. Never leave the reader clueless about where you’re going with something for a long time.
Visually emphasize the central points and make them as self-contained as possible. For example, in the statement of mathematical theorems avoid terminology whose definition is hidden somewhere in the bulk of the text.