I also don't remember seeing PhD requirement/advantage in who's hiring on HN. There may be, but they are for sure rare.
In my country, in some job positions, a company is also required to give higher salaries to PhDs, so they reject such candidates because of overqualification. I know of a few cases where people actually officially removed their PhD from their education list.
YMMV, and I am glad it's working out for you but, at least in my country, the reality is very different.