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myself said:
No it is
well documented that a person who has "switched" into an alterneate state (alter) they can only act out what is contained within that memory piece, and a person cannot be made to act out anything that is not a part of that piece of memory (alter). This is one of the ways professionals have come up with on how to distinguish true DID from DID want to be's.
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Maybe you could link some souces?
Maybe that is from your own experience... but from what I have seen (being non-DID) alters can have new experiences, learn, adapt, grow... you make it sound like they are plastic, unflexible and unchangeable
I am not going to comment on your interpretation of the DSM IV ... but you make it sound like a whole lot of ppl do not and cannot have DID

... I imagine this will be causing a lot of self-doubts

... I believe the diagnosis criteria are more open than that ... maybe at first, the alter believes that the situation he/ she lived in is true for now, but I reckon that they can realise that things have changed and adapt to live in the here-and-now.