> Project Volta focused on Battery Life
According to Google. According to independent benchmarks, battery life got worse on a whole slew of devices.
> They changed the entire runtime to ART for performance
But did it actually get faster? Not by much.
> Material design was a much needed solution to coherent UI across Google's properties
Are the UIs coherent across Google's properties? Half a year on the answer is still no: Implementation is spotty across the first-party apps, many of which directly violate the guidelines given to developers.