Laptops with SIM cards/mobile phone functionality are becoming more common, as are hybrid devices like Microsoft surface. These have arguably the same need for not syncing on metered connections as well as not syncing while discharging, but sadly that seems to be locked away into external wrappers like syncthing for Android.

See also #8392 where I also explained more conceptual reasons, particularly also that most of these mobile-specific features related to power saving or data saving just aren't really related to making a platform-specific mobile UI or to a platform-specific way to install. So this seems to just lead to a strange fragmentation in terms of how syncthing can be used that doesn't seem to be useful.