One thing I don't understand here: why is the Accessibility tab not shown by default? Accessibility is something lots of developers don't even know about. I'm sure having the tab visible by default would help greatly in making developers more aware of it.
The article has this to say: "This is because the accessibility engine runs in the background when the accessibility features are turned on. While it’s running, it slows performance and takes up memory; therefore it interferes with the metrics from other panels such as Memory and Performance as well as overall browser performance. For this reason you should keep it turned off when you aren't specifically using it."
This way you can get feedback from experts in the field to refine the interface and features. Once you have a solid viable product, you can show it to the rest of the world and see how well it serves the needs of people less in the know, without frightening them with a half-baked tool.