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You open a combo box and you can't focus on the list item you want until it's stopped wobbling around like a jelly.
?? That is absolutely not the default. Combo boxes, menus, and notification windows (among others) have never been wobbly by default. If by some case of temporary collective insanity wobbly windows did get set for comboboxes (or menus or...) turning it off is a checkbox away.
You and I may be able to see the spaces between pixels sometimes but other users cannot. The windows are too small to be able to determine which is which by an average user.
So we are better than the masses that use Linux? What masses? Any user who gets that far will be competent and it hardly takes a special skill to recognize windows. (Further I do not think the wall in that demo is at the default settings, but I am not sure.)
The wheel switcher is too quick. No regular user could tell what was happening there.
There we are with that regular user thing. do you think regular users are incompetent? Besides, the wheel switcher moves exactly as quick as you do alt tab or whatever you have it set to. If it goes by too fast.... guess what? Don't hit the keys so fast.
Beryl is nice, but anything but increased usability. Even the Zoom feature wobbles and shoots about too fast. They need to calm it down a bit!
I understand it's all customizable to the n'th - but if the defaults are like this then what's the point.
As I pointed out wobbly is not the default for combo boxes and is easy to completely disable. Wheel is human controlled, and at a guess you do not use Beryl or Compiz.
P.S. A more sedate set of defaults (or a set of configs "conservative". "some effects", and "maxo zoom dweebie") might not be a bad idea but the argument you are giving above is fallacious.