As reported at WP:VPT#Category changes in watchlist in mobile view, there is no checkmark in mobile watchlist to hide category membership changes. This greatly decreases the extent to which changes can be reviewed from watchlist on mobile.
|T125171 [Catwatch] Filter for Watch edits which add or remove pages from a category
|T9148 Watch edits which add or remove pages from a category
|T127723 Mobile does not display checkmark to hide cat membership changes