semilog
curmudgeonly optimist
IMHO obviously this could be speculated endlessly, but I am pretty sure that detail was not an objective of live view.
Erwin Puts, and Lloyd Chambers (e.g., here) among others, would disagree with you.
The plane of critical focus is far, far shallower than indicated by a DoF scale, and field curvature is present even in many of the best lenses from Leica and other marques.
This is in fact easy to see. Put, say, a 35/1.4 ASPH on any good mirrorless body (NEX-5, GRD, XE-1, OM-D, etc.) and use magnified live view to focus. You will see, in real time, that considerably finer adjustments than suggested by the DoF scale make a big difference.
For further information see e.g. John Williams, Image Clarity, ISBN 0240800338.
I find it bizarre that Leica shooters would spend huge amounts of money on optics and then reject a feature that allows the performance potential of those optics -- the reason for spending big bucks in the first place -- to more readily be harnessed.