Maybe repartitioning the internal storage (very maybe, depending on how the ncsd header = partition table is signed)
Dumping the bootrom (only possible because the bootrom has further bugs than sighax alone)
Modding any console on any firmware, even if bricked, as long as you know what is in the kernel partitions (which is the case if you're on a stock system)
And every cool thing that was already possible with A9LH; sighax is a big discovery but not that big of a deal