A sub-task does move through its own workflow, which does mean they're independent. But, the point of sub-tasks is that they are part of a parent, so the board does attempt to show you that relationship.
Estimates for issues do roll up from sub-tasks too. But, they only do it in "plain" JIRA, and it's purely a display of the sums. JIRA Software does not roll data up from sub-tasks, it considers each piece independently of its parent. You need to do some coding to make it work, but it seems to be impossible to get a standard approach agreed across all the users who have asked for this.
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