Something that seems to be overlooked in this thread is that mental illnesses can vary like crazy, not just in intensity but also how they manifest. The way Shallan’s mental illness and trauma manifest are not going to always fit the bill for what other people may have experienced with MPD, but largely I think she’s, if anything, a little stereotypical in that respect.
Threads like this just call to light the intolerance that people have for severe mental illness and tbh I think it’s a little disappointing.