I redesigning a GUI of a programm, that is in use by customers for several years. Now the icons should be replaced with more simplified versions (like
Metro style) and also the design regarding the shape of components and its color should look more puristic. So the GUI will change reagrding icons and slightly regarding other styles like color and shape.
Now I am thinking, wether its a good idea to offer some sort of
Classic Mode showing the application in the old style in addition to the new style e.g. for customers who are used to the old design and don't want to get used to the new one.
Ignoring the extra effort to implement the design switch, i don't like this idea, because it breaks the rule to have an consistent GUI for every user. On the other hand i like the idea because it takes care of the less flexible users who don't want to change to a new GUI.
So my question: Is it a good idea, to offer a
Classic Mode in addition to a new design in an application, that is already in use by customers for many years?