Is this washing machine yours? Or is it owned by the landlord? If it's the landlord's, that's a different problem entirely, since now you need multiple people to have separate configurations on the same device to get notifications, but only when their particular load is finished.

I can absolutely see a reason to have "smart" laundromats for things like error codes, abandoned loads, usage statistics, maintenance history, full coin reservoir, etc. That's the type of problem a shared laundry room would have as well, and it would be fairly easy to add a "tap to notify" feature where you scan a QR code or tap with NFC to get remote access to it.

But for a typical home situation where the laundry machine is the apartment or house, I really don't see a point, and it's just a liability.