I could come at that from the opposite direction: maybe getting perfect renaming is impossible, but the incredible slowness of asking Git for a file's history m

I could come at that from the opposite direction: maybe getting perfect renaming is impossible, but the incredible slowness of asking Git for a file's history makes it utterly unusable in some contexts, where Mercurial/Subversion/Bazaar's rename tracking makes the same operation lightning quick. Maybe it's impossible to get it perfect, but if it can get good enough, the reward can be tangible.