If search is responsible for the majority of traffic to a customer community, it helps to optimise your community for search.
For example, take this question from the Kronos community:
It’s a valid question with a good answer. But it would get more traffic if it included the product name, Kronos’ name, or anything which would clearly identify this question as relating to products.
Move this question to another community and no-one would have any clue what company you’re referring to. People searching for an answer know this and will include the product name or the company name in their search.
These are the kinds of questions you need to tweak the titles for. Members are unlikely to do it themselves – so I suggest you set aside time each week to update old titles to attract more search results.