HN is not the whole internet. If you have strong feelings about the current NCAA football rankings, or stupid policies of NYC's Dept. of Homeless Services, or the horrible ethical issues raised by Scorsese's new movie Killers of the Flower Moon - there are a zillion other sites where you can raise and discuss those.
And if the managers or users on those other sites are quick to flag and ban posts about the relative merits of MySQL vs. PostgreSQL, or awesome CSS tricks - that's okay, too.