There's a simple solution to at least the text problem: software control. On most web browsers you can embiggen or ensmallen the font with Ctrl-Plus or Ctrl-Mi

There's a simple solution to at least the text problem: software control. On most web browsers you can embiggen or ensmallen the font with Ctrl-Plus or Ctrl-Minus. And every app has a way of controlling audio volume, and often the OS and/or hardware that the app runs on can also control the audio. So I don't think that's an issue at all.