Good one - that sounds like great optional behavior. Having said that, I consciously built it this way. I personally use simultaneous stopwatches to track a full day of work and tagged items within that day, such as a specific meeting (each another stopwatch).
The "Personal Time" option subsequently merges the overlapping hours so that on Statistics, I'm looking at time spent in real life (as a person), while still being able to zoom in on specifically tagged items.
The "Personal Time" option subsequently merges the overlapping hours so that on Statistics, I'm looking at time spent in real life (as a person), while still being able to zoom in on specifically tagged items.