My washing machine is in a remote part of the house where I can't hear the alarm. The only thing a smart wallet could offer me that is compelling is a notification when it's done. But I could get the same result from a power monitoring smart outlet
With my ADHD, having it automated to remind me is much more reliable than hoping I remember to set a timer somewhere, not to mention that my washer and dryer will both lie about the time remaining on a cycle