When client pages are deprecated, this changes the default flow of the client application to include the replacement functionality. This has two results that do not occur when other artefacts are deprecated:
Consistency of the User Interface: If existing client pages have been customized or new pages added which are used in conjunction with deprecated pages, then the resultant user experience may be changed with the replacement pages. If this is the case it will be necessary to consider updating the customizations to be consistent with the replacement pages, or reverting the default flow to use the deprecated pages.
Documentation/Training Materials: If descriptions and/or screen shots of the deprecated pages have been included in custom documentation/training materials, these may need to be updated to describe/show the replacement pages.