Regardless of what X2's new lanes bring to the table, I wonder why the maximum vertical zoom is restricted to the height of a track?
I suppose it might be a throwback to a time before track layers, when it might have been assumed that we wouldn't need to see any more of a single waveform to be able to work on it (or even two waveforms in the case of a stereo track).
I know absolutely nothing about programming, but I wouldn't have thought it would require a big change in the code to allow us to zoom in closer vertically.