Hi Wolfgang,
the post you mentioned deals with problems of validating via Geocaching LIVE connected with transferring settings backup to another device. As Menion wrote in his answer - the manual isn't the place to explain why things work or don't work unless its necessary for understanding a particular feature. All features you've listed in the table require Internet connection and valid geocaching.com login. As in the case explained in the post above, the login was broken as it wasn't backed up. Or, as happened a while ago, some externals like e.g. G4L addon are updated which requires renewal of login ticket. There surely are more cases when the login is required repeatedly but the manual regards only ordinary actions, not these above mentioned - that's why we maintain the support page as well.