How does a Karaoke app manage to go entirely unattended for multiple hours? Don't people select songs? It's an inherently interactive experience. I don't think it is a great thing for an app to send false user activity indications to the OS. Maybe it could do something when microphones are turned on/off or when people are singing if mechanisms allow.
There's an option now to disable the screen saver, it was added when my 2018 75UJ657A was pushed to 06.00.04. I I noticed a few other things too, like being able to turn off the images it shows when there is no signal. Personally, what bugs me about screensavers on most devices isn't that they happen, but that they show some kind of animation stuff and keep the backlight on. It seems to me that the screen would be best saved by having it just go to sleep like my laptop and phone do.
