if you use two or three or more dimension styles in your drawing, and you need to often use switch between different styles in the same drawing, it is not sensible to go through so much work just to change what style is going to be used for the next dimension.
You have to place each dimension, which is placed at the current style, but you have to use right-click->properties, and select a new style if you want to choose one of your other pre-defined styles. This is really crazy when you need to place many dimensions of varying decimal places or fractions, or some mix of each.
To compare with AutoCAD, it uses a drop-down box up in the top toolbar area to display the currnet style, select the current style, or choose a style to apply or use. It makes detailing very fast, as opposed to the way Alibre makes you open a dialog box just to change each dimension, or even more hoops to change the default.
I want an easy way to choose the current default style, and an easy way to apply a style. AutoCAD's drop-downs are about as easy of a UI solution as you can get.