Yes, they are off by default...

they are completely off for me

Yes with setting switch off when I shut down PC automatically TV goes off otherwise I am very satisfied prefect for games etc...

Yup

Yes, that is not a problem

You can switch off the device in the bottom centre. See BN81-23924E-01_WEB_G70NC_EU_DEU_231116.0.pdf in the zip file from https://org.downloadcenter.samsung.com/downloadfi...