Would it be possible to develop every letter in the MBTI so well that, in a sense, become IESNTFPJ? Not that I wanted to, INTP is as close to perfect as I wanna get, and I didn't even have to work for it...
It wouldn't be perfect to be IESNTFPJ =3
That and INTP is whot yeu favour; it doesn't necessarily mean it's whot yeu *ARE*, it just is yeur preference, so obviously yeu'd consider it perfect XD
But seriously, it's not possible to be both anyway. Each is a preference of two polar opposites. If yeu equally prefer all things then yeu are nothing. Closest yeu could possibly come is I in some cases, E in others, which everyone does ANYWAY, because we all have moments of either or.
We need all of the functions as well; ni, ne, si, se, ti, te, fi, fe, they're all useful and all needed to some extent depending on the situation at hand. Some cases Ne serves very well at deflating a heated argument. Another time Fe may do the job better. Or Ti. Or whotever. All yeur MBTI result is, is which one yeu "prefer" to use... which isn't even necessarily the one yeu DO use the most, or are most adept at.
MBTI can only measure yeur preference. If yeu highly admire Ti but have virtually none of it yeurself despite trying yeur hardest, yeu'll still score as high Ti. It's whot yeu WANT to be. Therefore it's pretty hard to want to be 'everything', as everything has different qualities; some yeu'll value, some yeu won't.
I recognize some inherent usefulness in being a J, but I also realize P has more personal value to me. J's have more orderly lives normally... considering how mine goes to hell and back on a regular basis, I couldn't survive as a J because I couldn't cope with the massive amounts of change. Do I want to be both? Not really. I recognize both have their time and place and certain things they excel at, however. That's about as close as yeu'll get to whot yeu're suggesting - to understand the value of both and be willing to try to put aside something yeu're good at using which just doesn't work for a given situation, to use something yeu don't really care for or are unskilled in, because it's simply more effective.
That's all yeu can really do.