I think the idea is that HP makes suggestions to improve the titles with the idea that a better or more descriptive title will get more hits in the search engine. What I've found are that most of the suggestions I receive are stupid and make no sense. Every time I've clicked on a title in the list, they suggest I add words which don't fit. For example, they've suggested I add the word "Hubpages" to a hub about burial practices. I don't see how it fits. The best advice I've gotten from several hubbers is that if the suggestion makes sense, add the word or words; if not, ignore the suggestions.