[MereInterest]

Not only are they jumbled, but they also change size/shape depending on the width of the window. A large button when full-screened becomes a small button when in a smaller window. A large button in a smaller window gets expanded to show all sub-options when maximized. There is no visual consistency for the same button.

[ModernMech]

That was a feature designed to fit more options on smaller screens. I personally like it and find it helpful.

[gmueckl]

It messes up any attempt to recollect of the locations of certain features in the bar. Some iterations of the ribbon even fold groups into menus under single buttons, so the exact path to feature then depends on the width of the window. This turns the ribbon into a pretty inconsistent user experience.

[ModernMech]

I don't recollect the location of features by their spacial location, I recollect them by their place in a hierarchical ordering. The exact path to a function is always preserved, as the keyboard shortcut for that item is defined by that path.

[gmueckl]

Ribbons (in Office, at least) change that very hierarchy depending on window width. For example, take the Home bar in Word: the "Editing" and "Style" groups collapse to buttons with submenus before the width of the window is reduced to half screen width on my computer. This affects keyboard navigation in the ribbon bar, too, of course.

[ModernMech]

This doesn’t actually change the hierarchy of commands, as evidenced by the fact the keyboard shortcuts stay constant. I appreciate hiding these first before Font, since I use Font more than Styles or Editing.

[gmueckl]

What hierarchy is supposedly staying constant? Keyboard shortcuts have no hierarchy.