I don't think these issues have been addressed.
For example, the mouse-over scrollbars, the dock, and mouse-over features in general create ergonomic trouble, and given the latency, can be ergonomic nightmares. Even after disabling the mouse-over scrollbars, the normal width of the scrollbars is too narrow. I think the reasoning was that people can use trackpad scroll and/or scrollwheels, but trackpad scrolling requires really good hand-eye coordination, and scrollwheels cause tendon issues.
For another example, Unity is supposed to use an alt-tab key combination to switch between windows. Gnome 2 made it easy to use the bottom panel to switch between windows. alt-tab is convenient if you can type two-handed or can type left-handed, but it's really awkward if you can only type right-handed. I have coordination issues and can't type two-handed. A few years ago I was hit while crossing the street and had my good arm in a sling.
You know what? Making Ubuntu *usable* for people with injuries and/or disabilities will tend to make it easier to use for those who don't. I'm surprised, and angry, that this has not been a priority. And those design decisions show that it hasn't been a priority.
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