> The least time you spend on them the better, nothing good comes from dwelling.
Negative visualization https://en.wikipedia.org/wiki/Negative_visualization is absolutely a thing. If you do it properly (aiming towards psychological resilience and gratitude for the things one actually has) it can work quite well.
> Unlike the general focus of creative visualization of inducing an imaginary positive psychological and physiologic response, negative visualization focuses on training the practitioner on the negative outcomes of realistic life scenarios to desensitize or create psychological fitness in preparation for real-life losses
Something existing and some people thinking it is a good idea doesn't mean it is. I'm not saying I'm right either, I'm sharing what I do and what I think. And what I think is that negative visualization is ridiculous. Live your life, bad things will happen anyway, why do you want to be sad in advance just to maybe be a little bit less sad later? I can't take this idea seriously, it's like someone who doesn't want to love for fear of getting a broken heart.