At first, it did indeed caught me off guard... why was Apple, a company whose products I equate to be the pinnacle of principled UI design, so pushy and so annoying with notifications that I take a moment to breathe.
But then I observed something truly remarkably: it wasn't just randomly, aimlessly spamming me with the notifications... it was giving me these notifications at very key times. It gave notifications during times of acute distress, times when I was feeling off one way or another. And by golly, when I did then stop and take its suggestion to stop and do its guided breathing exercise, wow, it helped.