The problem is that the touch sensors (digitizer) are integrated with the outer glass, so if you crack the glass it breaks the circuit for the touch sensors. The galaxy nexus had a seprate layer of glass on top and I ran it over with my car the screen is cracked all over but the touch sensors still work great. For a diy, its not too difficult to replace the G2 lcd and digitizer. for about $90 and a cheap heat gun looks good as new. the digitizer itself usually goes for $40 but is extremely difficult to separate without tearing the lcd.