HN has some peculiar medical fixations. It comes in waves. For a while there were a lot of submissions about intermittent fasting. 15 years ago people were excited about polyphasic sleep. 10 years ago it was all about modafinil. Enthusiasm about ketamine for depression was big, but it seems to have finally fizzled out.
Ketamine is still used for depression quite effectively.
It's good that techbros' interest in it fizzled out though. Better for everyone that way.
Wonder what the approach would be to empirically determine these waves.