In addition, the output is certainly more convincing at this time.
In the first paragraph, the orphaned word is "of". If there's no way to squeeze those three characters ("of.") into the preceding lines then one should probably be a little more generous with the character spacing in the second line so that the "of." doesn't look so lonely.
It is possible that as it happens there is no clean way to format that paragraph, or that Sile simply prioritizes other factors over orphan lines, but for a paragraph that opens with "SILE is a typesetting system. Its job is to produce beautiful printed documents.", leaving three characters orphaned on the final line is unfortunate. If nothing else I'd reword the paragraph to address this problem.
One of the things I like about LaTeX is that you don't have to know about this stuff, and since it's not entirely trivial to change the page margins it's really hard for a novice to make such a mistake.
- There are two sections demarked with horizontal lines, but the upper one is further to right right.
- The horizontal lines spill over into the right margin on the first one.
- There is an unreasonable amount of space above and below the second one.
- The paragraph "To begin with" looks stranded; it's indented because the rule is no doubt all apart from the first paragraph must be indented but it looks strange in this case.