Yeah I find breathing naturally is the best and artificial interventions while are useable in specific situations the best in general is to just let things flow naturally.It seems to work well for some people, but not for me.
I did Buteyko breathing for almost a year (Wim Hof before that) and it increases stress symptoms for me. I am not in tune with my body when I restrict breathing in that way. Makes me feel jittery, impatient and kind of unable to solve problems in a constructive manner. Breathing freely, deeply, like a smooth wave, makes me feel and perform best.