In the US at least, if they didn't want to go where you were going they wouldn't pick you up or would make you get out. That's not a problem with Uber. I've done 1hr long uber drives without complaint to out of the way places. Very impressive that Columbia is so far ahead here.
2) Will the credit card machine in the taxi always be working?
In the US at least, they always say the credit card machine is "broken". I would explain I didn't have cash or access to cash and since the machine was broken I wouldn't be paying the fare. They would then "fix" the machine. What a joke. Very impressive that Columbia is so far ahead here!
3) The taxi commission did not enforce behavior for drivers
Talking on the phone, driving unsafely, smoking etc were all common. Does Columbia have great enforcement in all these areas based on rider complaints? Very impressive that Columbia is so far ahead here!
4) If paying in cash the driver doesn't have change (which makes no sense since he gets lots of cash).
That said, I'm going to Bogotá at the end of the month and it is annoying to see there won't be Uber available. It is pretty convenient, just for ordering with the app, the cashless aspect etc, and was a great extra option.