There's a simple but subtle difference in "why didn't you just x" and "did you try x". The first one has negativity associated with YOU in it and feels like it

There's a simple but subtle difference in "why didn't you just x" and "did you try x". The first one has negativity associated with YOU in it and feels like it focuses on your past. The latter is neutral and it feels like it does not care about the past, more like a suggestion for the future.