Interesting setup. Usually when people do these types of arguments they are blatant strawmans but your one decent and almost correct but still wrong.
This is wrong. Here is a counter-example. Warren Buffet is an SLI-Te subtype. His core competency is SiTe. He reads the 10K reports from firms (Si) and choses to invest in the most productive firms (Te).
Now here is the interesting part. When you listen to him speak about why he invested in firms, his response is NiFe. He really likes brand. The image consumers have in their mind about a company (Ni) and how it affects their decision to by (Fe). Here is an example of Buffet talking about
Apple and other
firms.....
To go a little off-topic here, the ego and id are the core competency blocks while the super-ego and super-id are calibration or control blocks.
....So without the super-ego block, Buffet wouldn't have the calibration to utilize his ego block.
You are semi-correct that the vulnerable function is a poor uses of one's mental resources BUT at a certain point, it becomes the best function to develop. I like to imagine the functions as a ship; 4D is the engine while 1D is the anchor. Yes, you want to focus primary on developing that engine but at a certain point, if the anchor hasn't been raised, it'll stop you dead in your tracks.
You don't have a choice between ego and super-ego blocks to use.
1. You can only access the conscious blocks well consciously.
2. The 2 conscious and unconscious blocks both carry one of 4 Jungian dichotomies (S/N & T/F)
Therefore if you are talking about a subject that's outside of your ego block then you have to use your super-ego block.
e.g. I am NeFi, my ego block handles intuition and ethics so if a conversation is about sensation or logic then I have to use my super-ego block to address the subject matter.
You are correct that your poor mastery of the functions means you will likely send confusing messages but you don't have a choice if the subject matter falls into those blocks.
In the cycle theory, Alphas do all the creating of new stuff. In reality, Gammas are the artists and engineers.
HAHA. I've done more research to improve Socionics than anyone on this board. And it's evident my understanding of this theory is at a higher level than yours. I would recommend not being so cocky and realizing other people might be more advanced than you.