Because children start out with the brain and the cells that they initially had. One thing that does not change is the personality you have a personality from the day you are born. The personality is the way you are when you are born and cells create your body and your mind. This is stable because it is like your chromosomes predetermined and does not change.
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Answer:
In Stranger Things 4, what I think is going to happen? Well, I think Season 4 is likely to concentrate on Eleven and how, or whether, she ever gets back her abilities. El loses her abilities at the end of season 3, after the fight at the mall, and she can no longer shift objects with her mind, or find people in the void.
Level of importance that is because you cannot