Network Equipment I actually swapped a decent amount of it - The testing showed the Netgear managed switches were using around 1W each, opposed to 20w for the DLink switch, and another 20w for a Unifi Switch.
The Hob/Microwave I manually just power off now as I don't need them on all day long, and devices which I put Alexa controller relays on were the aircon units, my PC & Monitors and the TV & Surround (other than Sky Box)
Vampire/phantom power was a specific problem where devices that were turned off by the user would still consume 5-10w. The only way to remove that power use was to completely cut the electricity to the device. From testing I did a while ago, devices made after around 2010 don't have this problem.
Deciding not to turn off a device can certainly be a problem. But it's a relatively new one.
The refrigerator isn’t constantly cooling. You could consider the time when it is cycled off to be idle. Of course it is constantly monitoring for when it needs to start cooling again. If it’s well insulated and your home is a reasonable temperature you can probably turn it off at night when you know you won’t be opening it. I don’t have any expertise. I’m just speculating.
The compressor is going to run in the morning though to make up the lost cold unless you want your ice to melt. Seems the marginal benefit would be tiny. It probably messes up the cool/defrost cycle that modern fridges go through too.
>Edit, here's a very quick screenshot of the spreadsheet and data I've got to hand at the moment, in time I'll get something better cleaned up and together.
Many of the items on the list stretch the definition of "idle". For instance, network equipment. Sure, I guess if you're not using the internet at a given time it's "idle" and therefore can be turned off, but your use of it is so random that you effectively can't turn it off. Same goes for "clock and alexa". The networking equipment category alone makes up 78W, or 20% of the total. Also, listing fridge as "idle"? You effectively need it on 24/7.