I got an LG C2 and immediately plugged a Roku into it. I've spent less than 5 minutes total looking at WebOS. I also have OpenWRT's ad block setup enabled on my router. If there are ads on its home screen, I am blind to them.
The Roku remote controls TV power and soundbar volume just fine. CEC didn't seem to work quite right, so I enabled the Roku's IR blaster feature. The LG remote can control the Roku as well, through CEC.