That to me seems ungrounded, unrealistic, magical expectations. (Not a personal attack, read on for the real point.) And actually, people do go back to their usual self once they go back to the usual days of living from the honeymoon period.
Actually to me this is the one that's not magical, bc to me it's more realistic to just accept someone as is. I don't see anything immature about that. To me wanting to change the other person is what's immature.and not just be ourselves and wait that someone magically accept it all because they're our dualz. which is extremely immature and delusional.
But then this whole difference in our opinions here makes me think of Mars vs Venus books.
Mars: accepts the other person as is - this approach is more often the man's supposedly. Men (at least stereotypically masculine men) supposedly take action in the external world/change the external world, not themselves.
Venus: wants to change the other person - this approach is more often the woman's supposedly. Women (at least stereotypically feminine women) supposedly approach their internals more easily, and change themselves rather than the external world.
If you wanna link it with socionics... feelings are internal stuff (your Fi/Fe/whatever), objectivity about material stuff (your Ti/Te/whatever) in the world is the external stuff
I have considered that many marriages fall apart because of this difference coming out and remaining unmanaged, after the honeymoon... Suppose a focus on all the emotionz in the honeymoon is pretty easy and then afterwards a lot of other things will too easily be in foreground instead, actually for the stereotypical women too, not just for the stereotypical men. And then stress over all the other stuff won't help ....
It's mentioned in several psychology sources but with a more realistic take than Socionics's.the theory of socionics duality is never touched, not even from afar
Here's an article. https://www.apa.org/monitor/mar04/mixing