Please do elaborate for a non-biologist - how and when is DNA sequencing worse at phylogenetic grouping than physiology? I had assumed the latter was embarrassingly outdated and easily duped (by convergent evolution, etc)
To be honest I'm not the best person to ask because every time I dip my toes in the area I realize (a) how little I know and (b) just how ugly these debates get. and (c) how much scientists like to treat some side observation as golden data that is absolutely right when trying to build support for their theory