I'm not sure I understand the point of your post. Are suggesting to remove these options ? Replace them ? Mentioning that they were recently replaced ? Please clarify :)
If your point with the "Mute tab" function is that it's useless, I'm not agreeing on that one. The sound icon won't let you mute a tab unless you open it first. And when you have a few tabs too many open, that sound icon doesn't appear anymore on the tab you are on. Also, it's nice to mute a tab that you know *MAY* produce sound (e.g notifications) before it happens, and thus before the sound icon is displayed.