I barely look at post titles, and I don't even mind someone "hijacking" later post titles by changing his post title, but it is annoying when I quote multiple posts and copy/paste them together. Like this post: I started by quoting PrimeNumber7, and now it has his post title. That would be fine if I wouldn't have added this, and it's even worse if I quote others too.
You can change the topic of a thread using the following procedure:
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I've never looked that far in that menu, but this is a great trick to know! Note that you can also lose the self-moderated status by moving your topic to a board that doesn't allow it, and you can circumvent the 24h delay on deleting posts by temporarily moving it to another board too.
But if I am replying to a reply, I will probably use that post in mine. No sense changing the title to the OP.
I'm quoting you, but this post has PrimeNumber7's title. I'm now paying attention to it, but normally I don't.