add mmc-utils package to all images
Both Netgate & 3rd party hardware integrators are increasingly using eMMC components.
SATA (& historically SCSI) drives have offered SMART reporting & analysis - however SMART does not work with eMMC drives.
eMMC v5.0 standard (published in 2013) specifies simple access to eMMC lifetime estimates & EOL info via extcsd data:
mmc extcsd read /dev/mmcsd0rpmb | egrep -i ^emmc
Fortunately there already exists a FreeBSD port of mmc-utils package which is tiny (40-60kB) and so could be easily added into pfSense images.
Hopefully a simple means of GUI access (eg Diagnostics / eMMC Status) to access these lifetime estimates & EOL info could also be considered.