ADHD, OCD and other neuro atypicals often need reminders or an action item that needs to be cleared. The features can be used by an infinite set of one offs, starting a load remotely before driving home from work, sometimes you are just under a time crunch. The burden of responsibility here is product enshitification not making us fear features, not someone wanting to utilize a feature rich product.

I can hear that sucker beeping anywhere

You can make them quieter or even silent these days with the "signal cycle" or similar setting, a legitimate thing I want to do but mine don't tell me when they're done so I leave them loud.

what's the big advanta of knowing exactly when the cycle finishes?

Even when on my Adderall I forget I set it all the time and wind up with smelly wet clothes too often. Also would be nice to get an alert if my wife set it without telling me, then I can easily swap it out if I'm not doing anything and she is.

I want a washer/dryer with these features now goddamnit

I hate laundry so try not to do it before I have to. However, especially with a family, that means I need to get through too many loads in one day. It wastes less of my time if I can feed them all through sequentially. Then when my minions are home from school I can make them cry at all the baskets of laundry to fold