I'm not convinced the title rules on HN are having a major impact on which stories get upvotes on a frequent basis, but that's just my intuition and you may be massively right.
In which case I urge you to, when you see an example where you think the policy has indeed had a negative effect (which I'd also suggest isn't quite as basic as "did it lower the expected number of upvotes" but also "and not because it removed clickbait from the title"), either comment mentioning dang's name and saying why you feel that, or send him an email to the same effect (hn@ycombinator.com)
Not only have I often seen him engage in discussion and be open to changes for a submission when people felt a title shouldn't exactly fit HN's usual rules, but I'd also expect him to be open to changing the rules themselves if your feedback leads to his agreeing that there's a trend of submissions having the meaning of their title unfairly changed due to the generally good rules.
All that said, it's not really an example of a "HN bubble", nor of an "idea" that isn't allowed on HN.
In which case I urge you to, when you see an example where you think the policy has indeed had a negative effect (which I'd also suggest isn't quite as basic as "did it lower the expected number of upvotes" but also "and not because it removed clickbait from the title"), either comment mentioning dang's name and saying why you feel that, or send him an email to the same effect (hn@ycombinator.com)
Not only have I often seen him engage in discussion and be open to changes for a submission when people felt a title shouldn't exactly fit HN's usual rules, but I'd also expect him to be open to changing the rules themselves if your feedback leads to his agreeing that there's a trend of submissions having the meaning of their title unfairly changed due to the generally good rules.
All that said, it's not really an example of a "HN bubble", nor of an "idea" that isn't allowed on HN.