Not require me to have to go up and down the stairs about 5-10 times to see how it's getting on, and then switch to dry, then check on its progress, etc.
The timer has a mind of its own (i.e. it displays an estimate of when it thinks it's going to be finished), and the option to automatically start drying after finishing the wash cycle is either not present or extremely well obfuscated (The model that shows up on Google definitely has the option on the rotary encoder, the one I have has no such option).