Actually, you have to unmount all partitions first to avoid filesystem corruption. That's the one thing that is absolutely critical.
After that, yes, remove power if you can. However the reason why Gnome is treating this bug as Won't Fix is because there are too many device types that are unsafe to power down. Devices like optical drives and card readers that look like internal devices to you, but to the OS are USB devices in some cases. So Linux thinks they're safe to power down (which you can't recover from without rebooting).
Actually, you have to unmount all partitions first to avoid filesystem corruption. That's the one thing that is absolutely critical.
After that, yes, remove power if you can. However the reason why Gnome is treating this bug as Won't Fix is because there are too many device types that are unsafe to power down. Devices like optical drives and card readers that look like internal devices to you, but to the OS are USB devices in some cases. So Linux thinks they're safe to power down (which you can't recover from without rebooting).