Hi there

Electronic devices are designed to go into standby, or soft off mode.

As @LightFoot  stated its true that constant full power downs and power ups will stress the components and shorted their life cycle, in exactly the same way it would with components in a computer.

Only ever turn it off by the remote power button unless its for the purpose of a full reset power cycle, at the end of the day this is why Sony has Eco modes and it is designed to use very little power anyway in standby so i really wouldnt worry about it.