@bbatsov asked in#216 whether the TOC satisfied my request for a distinct "bullet point" summary of the guidelines.

The TOC items indicate whattype of guidelines there are but not theactual guidelines themselves. For example "Link Breaks in ns" just tells you that the guideline isabout newlines inns but gives no indication of whether you should or should not have them nor of when you should have them. The TOC gives you an idea of what guidelines there are and lets you get to the guideline(s) for a specific topic, but you still have to go to each section, in turn, to see what the guidelines actually are.

I agree that duplicating content introduces a maintenance overhead but there is currently no way to quickly read over just the guidelines themselves -- you have to wade through the whole document, picking them out of the rationale and examples. I think having an easy-to-read summary at the start of the document is worth that extra maintenance.