A lot of people make assumptions when they find out we are a multiplicity.
Whether it be the assumption of the existence of an "evil alter", or the assumption that being a "Functional Multiplicity" means you're done, the assumptions all come from the same vein... That somehow being a System makes your brain vastly different from that of a non-system.
It's the D in DID.
While being a system does mean that a few brain functions vary, for the most part, the only thing that is vastly different is the experience. If we take away the aspect of "the experience", it comes down to only one major difference: Dissociation.
Systemhood requires dissociative compartmentalization of episodic memories. That is what makes it functionally different. Brains already compartmentalize episodic memories, Systems dissociate between those compartmentalizations. Which is what prevents those compartments from blending.
It's not the same, but it is...
A common reflex people have when hearing of another human's experience is to relate. A person will try to find experiences within their own lives that are as close to the one being articulated to them. And one of the most common phrases stated, when one is trying to relate to DID, is: "OH yeah! I'm a completely different person at work than I am at home, or with my friends", a reference to Code-Switching. (Altering your linguistics, mannerisms, behavior, etc. depending on your surroundings.) And while MOST Systems will agree that the comparison is fairly insulting, it is actually not too far from accurate when it comes to function. Those different "sides" to them are collections of blended episodic memories. They have compartmentalized their one identity to better fit their surroundings. And that's exactly what a system brain does, but it does so with dissociation in between. So those parts do not blend, or merge.
"The brain named its parts."
That quote came from a system we know. And it is absolutely true. All brains have parts, this we know. With systems, it seems each of those parts had been identified, named, and allowed to develop independently of the other parts. But that doesn't truly make a system brain all that different from a non-system brain when it comes to actual functioning. The structure is the same, the only difference is in the connections between parts. Non Systems are simply able to alternate between their parts with ease, and without boundaries and limitations on memories. And even though non-systems do not have identified, autonomous parts, their structure will still operate similarly to a system.
In system brains we simply get to see the brain experientially expressed.
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Inner Dialogue vs Brain Brawls