AnyOldName3

That’s a proprietary software problem rather than a being connected to the internet problem. One of the send-a-notification-when-it’s-done devices I set up took about as much effort as setting the right time on a phone alarm about ten times because the device’s firmware was open source with no companies’ bullshit involved, so all I had to do was navigate to the right page in Home Assistant and pick the right phone from a dropdown and the right even for the notification to trigger on from a dropdown. That’s not wildly different from picking the right time from a dropdown on a phone.

Again, that’s specific to it being proprietary software. I’ve got some devices in my home that are connected to the local network (but not the internet), and have configured Home Assistant (which I’ve got running on an old desktop PC) to send a notification to my phone when it detects that those devices report that they’re finished with what they do. That’ll keep working until I turn off the Home Assistant server or replace the devices.

That’s more effort per wash instead of being something that only needs setting up one and then will work forever. Also, it’s common for post-90s appliances to include sensors and vary the cycle time based on how dirty the water gets. Except for the data privacy and security concerns, which are mainly because it’s proprietary software rather than inherent in Internet-connected devices, there’s no advantage to using your phone timer over getting a notification.