With time tracking, "This Task Only" and "Total With Subtasks" show the same amount of time.
E.g., I have a parent task with 26 hours of tracked time, and subtasks with another 60 hours of tracked time. But the parent task only says 26 hours and not 86.
On Task View 2.0, it correctly shows 86 hours, and says 26 hours for "This task only" and 86 hours for "total with subtasks".