It's partially the composer style (software). It particular the oversized paragraph break (double, triple, or even quad line space where and indention alone suffices).
Many, maybe most (?) books use paragraphs grouped into "sub-sections"(within chapters/section/subsections/paragraphs); each sub-section using a multiple line space to note itself. (Sections might use a breakine or bullet)
This composer doesn't lend it's self well to those that tend to write in that style; the extra space simply isn't used as efficiently IMO.
Myself for sure. I often use triple or quad letter space vs a line return and indention while composing. This allows more words to stay on the small screen of a phone. The small composer box of a phone only shows about 4-6 lines of type. That limit prevents easy review of what's been written where; which leads to "scattered" compositions and omissions, especially while editing on the fly . I sometimes forget to change these triple space paragraph markers into a return/indent.
Note the following double line space below↓ isn't really as effective as one in a book with indents only.
No author, I was a graphics major, text/font design studies, instinctive reactions to them was very fascinating; akin to how the casino's designs and colors "steer" you.
The design here is simply meant to be easily read on a phone at arms length using as little data, memory, and battery power as possible.
It's also taylored more towards short bursts of type and "live conversation" vs "logged" and ongoing. Some folk do this naturally, others need a whole page just to say "yes" with conviction.
Visually exciting design has been a downhill run after W7 Aero was canned and App. Crap took over..
I'm reminded of a form I just struggled over context with, because of the skipping the traditional "Oxford comma" the government says we don't need anymore. I bet the context questions will cost far more than the ink and space saved
Not all the composer menu options work on all OSs or browser versions either. So some things like bold, italic, line breaks, color, bullets; which are other visual options for a sub-break aren't there at times either.
I.e., I liked the old look (4-5 years ago) much better. It was easier to taylor the look and edit with close line spacing.
But I also like that our pals with poor eyesight can see better
Also note that "spellwreck" and "vindictive text" (auto programs) for google will turn every other sentence into nonsense. Shutting the options off doesn't stop it either. ...Ive literally spent two hours on typing twenty lines once.