Uber India — uber app lets driver cancel rides after 30 mins of accepting

Address:

Bangalore, Karnataka

Uber driver accepted my ride when his trip was in progress. I waited for more than 25 mins. He completed the trip and called me to ask drop location. I provided him info. Ride was cancelled in few mins. Uber driver made a customer wait for 30 mins and cancelled trip. Uber lets the driver cancel anytime after accepting even after 30 mins. Once the trip is cancelled by driver, uber automatically removes it from trips section in app.
Here comes the series of issues that uber has never answered:
1. Why can't we give rating to the driver who cancelled our trip?
2. Why can't uber deactivate cancel option after 5 mins of accepting ride? In this way uber can avoid such issues?
3. Why does not uber take actions against drivers who enquire about drop location and then cancel based on their choice?

Please find attached screen shot o[censored]ber driver who made me wait for 30 mins and then cancelled trip.