It's easier to read but it also has an aesthetic that reminds me of the children's books I used to learn to read with in primary school. Comparing the text as-

It's easier to read but it also has an aesthetic that reminds me of the children's books I used to learn to read with in primary school. Comparing the text as-is and in reader mode, you see that the font the author choose is bolder (for lack of a fancy typography term) and the space between the letters seems to be smaller. If you increase the space between the letters with CSS using the letter-spacing property just a little bit, I think it's just as easy to read as in reader mode.