I have not had a problem so far with ARC and Sonos, but so far, it has only been with Samsung and LG televisions. I am naturally suspicious of Sharp.

The last experience I had with a Sharp television, outside of just plugging HDMI inputs to it, was trying to make a playbar work with one. I had to go into settings, to enable the optical output, and life was good. That is, until I turned the television off, then back on again. The setting disappeared. Repeated tries were also a fail.

I ended up using an optical switcher from each of the source devices to the playbar.