There are plenty of reasons to rent a car, from leaving a less reliable or gas-guzzling car behind on a long trip to getting around a city on a business trip or while your car is being repaired. It's not necessarily cheap, but if you need to move around a lot, or go any substantial distance, it isn't any worse than taking a cab, and it's more convenient.
There is a hidden danger, though, that not a lot of people realize. Rental companies upgrade their fleets regularly with newer-model cars, which means your rental has new technology, including a high-tech infotainment system. That's not the bad part.
Newer infotainment systems let you pair up your smartphone via Bluetooth so you can take calls over the car's audio system, dial from the center console or stream your music. Others include USB so you can get everything I just mentioned and charge your phone at the same time.
That's also not the bad part, as long as you own the car. When you're renting, however, it can be a danger.