When you include any indenting block of text in your blog post,
<blockquote> ... </blockquote>
<ol> ... </ol>
<ul> ... </ul>
for instance, the spacing of the posts, below the indenting block, would change. This makes the entire blog look sloppy.
Several workarounds were identified by various bloggers; not any one was simultaneously clean, effective, and simple, however.
After repeated complaints and reports, Blogger finally acknowledged the problem. Yet, it's still not fixed.
Blogger calls it "Cosmetic". We call it sloppy.