If you could move items/waveforms at sample-level accuracy, and you could also superimpose two tracks on top of each other, you'd be able to do the following:
When you're phase-aligning two guitar tracks, you'd be able to go beyond aligning only their transients, you'd be able to phase-align the bodies of the two waveforms much more accurately. Sometimes they will phase-align so well that it almost looks like they are one waveform (like this example below), And then you'd know you've phase-aligned them as perfectly as possible.
The highest correlation between the two waveforms is achieved. This way you can quickly judge where the transients are in relationship to each other and then how phase-aligned the main bodies of the waveforms are in relationship to each other, how correlated they are if you will. And then obviously you need to audition the change.
Call me crazy, but I think being able to move waveforms/items one sample at a time, is the most basic functionality of a DAW.
Also being able to superimpose two tracks on top of each other and do the above-mentioned trick is pretty sweet if you ask me.
Don't knock it, until you've tried it.
Here you can hear the dramatic effect nudging one of the tracks only a few samples can have. It also shows the superimposing trick I mentioned above:
