I go to the theatre around once/twice a month of average and I have noticed an increasing amount of smart watch wearers who leave them active during the show. Not noisy, but fully lit so they brighten considerably with movement. Theatre should be an immersive experiences and I find these intermittent flashes of light in my peripheral vision distracting and irritating. Of course it’s obvious that they should be putting them in some mode where this doesn’t occur, but relying on them to figure it out has proven insufficient. I think the time has come where an announcement needs to be made as they do with no recording and to switch phones off.