Nitpicky, because I get what you mean, but "self reflection will reduce stress and fear" is by no means always true and I'd argue it's probably not really true for most people in practice. Epictetus said (paraphrasing!) that people are rubbish at self-reflection and you need to practice it to be good at it, like anything else. Lots of people approach it in terrible ways and it leads to really bad outcomes - giving up immediately, doom loops, too much self-criticism - so it really does need to be done (to use a more modern reference) mindfully.