For most operations that can delete data, such as SD card partitions, restoring NAND, etc., there is a 6s warning message before you can continue to prevent you from irreplaceably deleting your data. However, if you tap on emuMMC, Create emuMMC, and follow the steps, Hekate will begin overwriting the EmuMMC and copying the SysNAND, without a warning message to stop you.

Although you could argue no one uses this screen very often, I still think it's important for there to be a warning message. I accidentally fell for this while trying to help a friend out with a NAND backup, and was poking around in Hekate and accidentally tapped on this message. While I have a relatively recent NAND backup on hand, I can imagine an ignorant user wiping their EmuMMC my accident.