[MrNice]

Regarding the CEC libCEC bug "CEC not detected, disable?" still present after boot
See #153 & #154 and GitHub

I don't know exactly what does this new feature internally but to avoid useless work I want to expose my use case:
I have a "IR controlled 4 sockets" where I connect my RPi supply, AVR, monitor and USB hub supply.
To start, with the remote I switch on the sockets. RPi starts, AVR and monitor go in sleep mode. Then RPi switch on AVR through CEC.
To stop, RPi shuts down and send sleep to AVR through CEC. Then after 1 mn controlled socket switch off.

So I need CEC enabled but I don't have CEC TV.
I will answer NO to the question and if I understand right I still will have the log spam.

Hope this will help.
Maybe you could forward this use case to the developer.