Emotional Intelligence It’s an advertisement.
You can look into studies if you wish to. Basically there are a few empirical measurements of human traits. There are the Big Five and the g-factor.
These can are known through a set of standard tests that have been given to many people over many decades from many walks of life. They are not completely accurate though.
There are other ‘ideas’ thrown around by other psychologists too such as ‘Grit’ ... generally these really boil down to a combination or one or more of the Big Five and sometimes combined with ‘g’.
My point being, what I mentioned above are the most non-reducible items of psychological research. Maybe some ‘emotional’ attribute exists too that is more distinct from these ... I’ve yet to see any compelling evidence for it though - I’ve looked a little and here and there. Some things look interesting, but most often it is someone trying to make a name for themselves and/or getting tunnel vision.
With what I was outlining before we’d expect people with good communication skills and experience to have a good degree of Openness and to be Agreeable probably. To use this efficiently I’d factor in the g-factor (as it is the best indicator of health and general longterm ‘success’ - as in good job and promotions.
To be clear, when I say ‘best indicator’ it is not a particularly good indicator alone. Once other things are factored in it can help get a better idea of someone, but individuals are pretty much individuals. We can discern a fair amount about groups of humans, but individual humans are a completely different and much more complex system to predict.
I don’t believe buddhists or stoics are somehow in a better position than psychologists to dismiss or back such an idea because I think they’re more concerned with ‘how to live life’ than empirical scientific research.