I edited this question (see edit history) to remove strikeouts and to generally, as I saw it, make the answer a little easier to read. The change was approved, but the original author of the answer then rolled the changes back. I have no interest in a roll-back war, but I'm wondering what is considered best practice for this site.
I recognize that each SE community will have different ideas of best practices, so I have no strong feeling on this for this site. That said, I would argue that blog-style strikeouts do not work well in a Q&A format. I would say it clutters the answer, makes it harder to read, and tends to hide (rather than highlight) the important information.
On a similar note, when quoting information on outside pages, should we generally bring the relevant parts (properly cited and linked) into the answer in case the external page disappears or changes or is a link-only answer OK?
Please note, I am in no way trying to criticize or flame. I'm just wondering what is considered best practice on this particular SE site.