I really hate it when a couple vaguely similar threads are merged for no real reason. It makes sense to merge threads when people post several threads about the exact same topic at roughly the same time, but there's no real reason to merge threads that are totally different from each other, or posted several months apart, into one amalgamated topic. It'd be like if a news site just merged all of the news on the front page tangentially related to the United States under one headline that said "The US Does Some Stuff". The value of separate topics is that you can go into one that specifically looks interesting to you. When they're all mashed together into one vague general topic, no one really wants to sift through 6+ pages of posts to see if there is anything worth looking at in there.