@kolla I think you misunderstand the situation. The classes included with ImageFX are necessary for it to work with older versions of Workbench- lots of users are not running OS3.5 or later. It will not work without it being in the package. However, in later OS3.5, 3.9 etc these were updated.
So if we assumed that everyone has compatible classes then all users less than 3.5 will be unable to use the application.
Going forward we will be replacing the classes with newer software that we have developed over recent years such as our Select Gadget. So far this has been on the Enhancer Software for OS4 but it will make an appearance on OS3 and ImageFX will benefit.