Because FKs on a relational model.. as an example, deleting a user/account might end up being a task on going through every reference to it, and the references

Because FKs on a relational model.. as an example, deleting a user/account might end up being a task on going through every reference to it, and the references to its references, etc. This is actually the reason some companies do not delete users/accounts [0]. [0] https://news.ycombinator.com/item?id=23005060 https://news.ycombinator.com/item?id=23005060