I have read that some functions cannot co-exist within the same person to any significant degree, of which I am most interested in:
Si with Ni
Se with Ne
This is despite them operating from almost the same part of the brain, and having some key similarities.
I am however disatisfied with any explanations read thus far as to why co-use of some functions is not possible, as opposed to merely inefficient.
So if anyone has an opinion about this, I would like to know:
a) Why they cannot work well together in the same person, just to give some background. If you can individually address Si/Ni or Se/Ne, rather than just say they contradict each other, that would be marvellous
b) Could they co-exist to a significant degree, and if not why not. Note that citing a) as evidence will not suffice as an explanation, as this is based on the faulty premise that everyone is well-functioning, with no internal conflicts.
c) Isn't it worth considering the co-existance of incompatible functions as a possible reason why some people are so hard to type as anything? Note that Isabella Briggs-Myers acknowledges that some people do not develop a clear type.