I love that “door open” warning of my fridge, and I also like that I get a notification when the fridge unexpectedly disconnects from the network (which usually means that the power has gone out, so I can go and check before all my food has died).
Also, the notifications when then laundry machine finishes are handy (so I can unload it and avoid smelly clothes).
Even better, install “Projectivity launcher” on your Chromecast.
I have it configured to only show the buttons for the 4 apps I use. Not a single advertisement on the main screen, and all is clean and fast.