Belief is irrelevant, it’s what evidence exists for that matters. Any intervention for PTSD that has an evidentiary basis and consistent effect across multiple studies is good. There is a tiny bit of that building behind Tetris as an intervention for traumatic experiences, including evidence that it may help prevent conversion of traumatic experiences into post-traumatic mental illness; be glad for that because it means people in the future may not develop PTSD at all. By any measure that potential preventative effect is more important than treatments that only work (if they work at all) for people who already have developed it, so Tetris is getting some serious research study… good, nothing to be frustrated about here. If ketosis worked for you, great, but there’s little more than exactly that anecdotal evidence yet, it needs time and investigation too.