replacing busybox by busybox-power eats rare precious space in rootfs (due to larger binary size of busybox-power), since busybox is needed during early boot and thus has to live in rootfs. I.E. it can't get optified. Busybox-power however doesn't - by default - bring anything new that might justify indiscriminate waste of rootfs space for it, on all CSSU installs. It's absolutely reasonable to keep busybox-power optional for those users who think they need it and want to accept the rootfs penalty it comes with. /j