or people like me who might need a phone reminder because I’ll forget I put a load in and get busy with something else

This. As someone with ADHD, it's very helpful to get an extra alert when my washer/dryer is done.

I used to pull this off with a Zigbee Smart Outlet + HA, which is frankly an OK fix, but did not work for my electric dryer.

When it came time to replace my old appliances, I got a smart washer & dryer, said what the hell and put it on an isolated network. It's connected to HA via the cloud (not ideal but ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯). It just works, and I wind up with mildewy neglected clothes less often.

It's not perfect, but I'm willing to deal with isolating 2 appliances to cover for my attention span.