Yeah. That's understandable as many TVs I modded for client has ground connection on ac but not used in my region too. Maybe it's not used for similar reason. I also checked circuit connection with electrician and oscilloscope to make sure it won't pose such risks in known scenarios including connecting both 3.5 and 4.4 at the same time. At least it seems to withstand short circuit on output connection before fixing it which has greater risks than 4.4 ground channel tweak to reduce noise with supported cables.