As other professionals have chimed in: Most post production audio engineers can do any of these roles. these are not so much specializations as much as divisions of labor. It’s hard to focus on designing a space shop sound of you have to engineer foley sessions all week. All these jobs have to get done and it’s easier for each member of the team to have clearly distinct responsibilities from other memebers of the team.
Edit: obviously engineers are going to excel in one role or another. A really creative designer might be a messy mixer for example
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