I suppose, the attitude of the PG community. I can think of one other time when the PG community was very dismissive of criticism from users, even when it is valid...
Not to defend the community at large to a fault... But there are an amazing amount of bug reports which end up being nothing. Its easy to dismiss something as a non-issue by not understanding the underlying cause, which is why the NFS / fsync issue persisted for so long. To be fair, it was also an issue in other DBs.
Not that it forgives the fact the bug was reported 9 years ago and it just recently got fixed. I know personally I'd have messed it up.
https://news.ycombinator.com/item?id=19119991
In that case they rejected a bugfix for something like 10 years, seemingly because of attitude issues.