If you tune a lot of cars they are a necessity. You can thank IMS for constantly pushing us to get some of these features out sooner.
Eg if you have a value file for most common injectors, open/loop closed loop setup. Boost maps for various turbos and wastegate actuator combos you can build a full tune up in 10 minutes at home before the vehicle even drives in, then all you have to do is trim it up on the dyno.
Doing everything from scratch each time is a very time consuming way to tune a car.
It is great when you guys ask questions, it helps us fix problems and make the software easier to use.