Theoretically, the 'Love Hormone Measurement System' has some utility. We form bonds to others with every kind word and familiar touch, it may be useful for many different populations of people to gain a clear sense of how they really feel about "loved ones", and why that is.

Also a general purpose sense of whether a person has spent too long or too little in the sunlight might be very harm reducing. A lack of light can cause myopia, too much is cancerous...

For myself...maybe a sense of polyrhythms?

when new age people use energy is a way that doesn't correspond to something that can be measured in joules that's bad

They use it in an unempirical way that corresponds to things that are literally nonreal. Besides, "energy" is a fine word to describe people "getting tired in social situations".

"But this distinction is not really tenable. Ultimately the illness and non-illness are very much the same thing", Sure, if you consider having not having use of both of your legs to be 'very much the same thing' as having two perfectly working legs.

Ugh are you are a bot or something? Such a cliche thing to say squints eyes suspiciously

Zoloft has actually been found to be one of the better drugs for cases of mild chronic depression ("dysthymia").