TouchID is definitely a cool little feature to have. Not only does it work good but it also looks sleek.
Apple invented the 4-digit passcode... and then invented the Touch ID to solve the 4-digit passcode.
Talk about inventing a solution to a problem you created in the first place.
Marketing geniuses at Apple.
Why would you not use it to unlock your phone?
On an unrelated note, it's best not to let your phone get to 0%. It's bad for the battery health.
Apple invented the 4-digit passcode... and then invented the Touch ID to solve the 4-digit passcode.
Talk about inventing a solution to a problem you created in the first place.
Marketing geniuses at Apple.
I use it all the time, and means I can use a more secure complex passcode as well. It works very, very well - I love it, definitely one of the best features when coming from an iPhone 5.
That's like saying your car's door locks or the alarm system are the best features.
Touch ID, meh. It's good but a bonus and nothing more IMO. Nobody keeps any data on their phone which warrants CIA-levels of security. A simple 4-digit numeric passcode is sufficient to keep the vast majority of people out.