I am totally sx/so.
I couldn't avoid that definition if my life depended on it.
Busted!
At this point in my study of personality theories, I cannot help but think that a person's life experiences, especially those during formative years (birth to age seven) contribute to the finite selection of personality types available to them via genetic inheritance.
I grew up as a military dependent, moved every two years, and have seen many differnt ways of doing things. I cannot help but believe that those experiences assisted in me ending up as an ESTP.
Genetically, I have strong evidence to have ended up as such, as my Father is a (tested) ESTJ. But he grew up and lived in one town, in a rural, Southern Baptist (authoritarian) household, until enlistening in the U.S. Army, and I think he saw things as very black and white (right or wrong)

as a youngster, where my experiences were much more varied and thus were read by me in shades of grey...
My Ennegram of 7w8 is also consistent with my upbringing (and genetics too!), maximize satisfaction to minimize pain, being a thrillseeker because I was exposed to alot that increased my threshold for stimulation, etc...
We are all products of nature (DNA) and how we were nurtured (upbringing). The geneticisits say:
Genotype + Environment = Phenotype
If two identical seeds of a mighty oak tree are sowed in different environments, one shady and dry, the other sunny and wet, which will grow to be the bigger tree, despite their identical genetic code?