I'm curious whether or not the people complaining about this have some kind of audio receiver or not, vs TV speakers. The receiver probably has better options, then the Roku feature, and it's probably just as easy, if not more so to use then Roku's implementation. I can understand if TV speakers are the only audio source here, but if you have an AVR / Sound bar with a night feature, does it really matter which device enables it?
It matters first and foremost because Roku advertised the Night Listening Mode as a feature for these devices, and it worked perfectly fine for over a year until OS 9 came along. Clearly the hardware platform supports the feature, so there was no conceivable reason to remove it in the latest OS/firmware update.
It also matters because having more options is always better than having less options. Not everyone has an AVR or TV capable of its own native "night mode", and thus the Roku is likely the only way they can achieve that.
I happen to have my Roku connected to a Sony AVR, which does indeed have a native night mode. I choose not to use it for at least two reasons: 1) I generally only care about having the Roku in night mode, not other input sources, and 2) I hardly ever touch the AVR remote, and so I'd have to reach for it just to enable/disable the AVR's night mode. I use only the Roku remote when watching the Roku, which allows me to control the AVR volume, as well as easily enable/disable night mode.
People are "complaining" about this feature removal for valid reasons. While I don't believe you are defending Roku, and your tips for checking if the AVR/TV have their own native night mode might be helpful for some...the overall vibe you're putting out in this thread is more or less "I don't use it, so what's the big deal?" Please, don't be that guy.