Yeah, it is incredibly easy to brick your Switch. Honestly there should be a payload where you're forced to make a backup on first boot.Yeah, stuff on the Switch is hella-dangerous. You have to know what you're doing or it's very easy to break things. I don't know why people don't make nand backups when hacking their Switches because there's quite a few people who are now out $300.
I'm pretty sure there's something similar to PozzNX but in NRO form but I'm not totally sure.