With current digital sensors exposuring correctly doesn't even matter that much any more because of iso-invariance when under exposing photos It still matters

With current digital sensors exposuring correctly doesn't even matter that much any more because of iso-invariance when under exposing photos It still matters a lot if you're not controlling the shutter speed and want to freeze action. Some cameras prefer 1/30 or 1/60 second exposures but faster shutter speeds with higher ISO is an improvement, due to iso-invariance or even just the ability to adjust RAW files.