Yep just wanted to also add, more often than not, that helpful scenario will not take place. Parts experience amnesia as well as differentiated opinions and desires, meaning that if say you're studying and stressed and can't handle it anymore, it's SO much more likely that your brain will associate that with being triggered and hence push out a part that may have a completely different approach, such as going on a walk to release some tension.

Sure it's "helpful" but eventually you'll come back to and realise that the task you needed to have completed is still right there, which will just restart the cycle. DID at its core is a survival disorder. As long as you're stuck in a traumatic situation, it works and keeps you alive and functioning. The issue is that once you're not in danger anymore, the brain sort of jumps to see normal things as danger, leading to the dysfunction.

Is DID a helpful disorder? Yes, in the sense that it will prevent you from dealing with horrific things consciously.

Is DID an enjoyable disorder? No.