Keeping in that same theme--I've love to see Mozilla Translations models (or similar) integrated in GNOME apps where it makes sense to do so--such as Document Viewer, for good-enough offline text translation built into every GNOME environment.
Such features are highly user visible and set GNOME apart from competition in ways that are easy to describe to anyone. No EULAs, no data sovereignty concerns, no dark patterns--just features ready to go for users out-of-the-box that are incredibly useful, user-friendly and consistent.
In saying that--there's of course all the great GNOME stuff under the hood for geeks too--support for almost every audio and video format to have ever existed easily enabled, glycin, sandboxing of applications, easy and consistent software package management for everything (now with obsolescence management built in too)...etc.