What evidence have you seen? Every research paper in the first page of this search is evidence that it works.

https://pubmed.ncbi.nlm.nih.gov/?term=mindfulness+meditation

It seems to be a staple for therapists and psychologists to improve emotional intelligence. It gives you clarity about what you're feeling, why you're feeling it, and what you're going to feel soon. From there it can be used for a whole host of other maladies: addictions, anxiety, depression, etc.