[RbnJrg]

Originally Posted by Turtle91

Yeah, my iphone 15 pro max has a 6.7" screen and I read in landscape mode almost exclusively. But, I find I'm slowly increasing the font size over the years which tends to create those rivers of white space again regardless of the font type...

When I do use justified text, as mentioned above, it is usually when I am inserting some other text that I want to differentiate from normal text. Then I have used a <div> and I style the paragraphs within that div as justified. That way the normal text has a left-alignment and the inset is visually distinctive.

Attachment 216976
Screenshot from Laurence E. Dahners'
Antigravity, Book 19 in the Ell Donsaii Story

h3::before {
  display: block;
  background-image: url(../Images/img_ChDiv.png);
  background-size: 1em 1.5em;
  width: 1em;
  height: 1.5em;
  margin: 1em auto 0.5em;
  content: "";
}

p {
  text-indent: 1.2em;
  margin: 0;
}

p.first {
  text-indent: 0;
  font-size: 1em;
  clear: both;
}

p.first::first-letter {
  font-family: serif;
  font-size: 2em;
  font-weight: bold;
  float: left;
  margin: -0.1em 0.1em;
}

p.first::first-line {
  font-variant: small-caps;
  font-size: 1.15em;
}

div.news {
  margin: 2em auto;
  border-top: 1px solid black;
  border-bottom: 1px solid black;
  width: 90vw;
}

div.news p {
  margin: 0.5em;
  font-size: 0.9em;
  font-family: serif;
  text-indent: 0;
  text-align: justify;
}

Nice layout! But did you the try to open that epub, for example with Google Play Books, and select justified alignment. What happens with the title and its fleuron?