Well, the other option would have been to start from scratch, I suppose. But with editing, things will diverge.
On the basis of the articles I compared, there is no sign of that happening as yet. For example the article on Sir John Sullivan is a direct reprint of a two year old Wikipedia article that used the Peter Watkins film "Culloden" as a primary source. Since that film is horrendously inaccurate, the article is equally so. The Wikipedia has been extensively revised since then and the Culloden references deleted.
I think this points to a basic flaw in the "Internet encyclopedia" concept. These things start out with the best of intentions but as time passes, the initial surge of enthusiasm fades away. Articles become neglected (in Wikipedia, it's easy to find articles that refer to things "expected to happen" in a given year now up to a decade in the past. As people drift away, maintenance becomes concentrated in fewer and fewer hands and the personal preferences of those people dominate the product. Rules intended to protect the integrity of the content become corrupted into protecting the opinions of the authors.