Watched a video on this several months ago [0]. I find the idea of inferring some stuff about the washing machine and dryer from a smart plug, but keeping the unit itself dumb is pretty good compromise. I mostly want a notification when the washer finishes in case I don't hear the beep, but I don't need to add yet another thing that needs access to wifi, talks to the cloud or otherwise messes with my privacy.
Bonus points: CV to watch for the done LED on the washer or audio processing to hear the done noise on the dryer, but both of those have broader privacy/computational load implications that make them seem less than worth it.