The topic that prompted this was actually a unique issue that would not have had a solution in an earlier thread:
A lot of the problems posted here require troubleshooting the individual case, and we usually prefer that people start a new topic for that rather than spamming someone's older troubleshooting thread. Plus @tdelmas makes a great point about many of these being locked.
Users will still see a "Your topic is similar to..." set of links when entering a topic title and have the chance to find a solution there or post in that thread if they desire. We just won't make them perform acrobatics with their title if they decide to open a new thread, which is often the right thing to do.