Carburetors in general are very reliable. Carburetors last nearly forever. If you rebuild every couple years, they are cheap and easy to work on, and super reliable. Always drain the fuel system if you aren't riding for a few months (storage). This will greatly reduce the chances of varnish build up in the fuel/air passages. And replace the carb needle once every couple years in the float bowl and you're all set.
You can bump start of kick start the carburetor bikes. That's not possible on a fuel injected bike unless the battery and starting system is in good shape. A dead battery on a injected bike means it's NOT starting. Then you need a friend with jumpers at a minimum.
My bike is carburetor and I now carry jumpers, simply because I was on one ride where a guy on a 4 stroke killed his battery MANY times!! Something was seriously wrong on t hat bike, and two other riders played musical batteries for the majority of the ride when he stalled it or stopped the engine without thinking. No one had jumpers. And made me think about the hour plus I spent standing around while they removed seats and swapped batteries around to charge the dead one in a kicker bike until he killed it again. LOL....
I guess the take take away is regular maintenance is important. But it was not that guys fault really, he was on an unfamiliar rental.