It can be useful to bulk load data into a temporary table, do validations (which may involve joins to your permanent tables so it's convenient to be able to do

It can be useful to bulk load data into a temporary table, do validations (which may involve joins to your permanent tables so it's convenient to be able to do in the database vs the application) there, and then once everything is validated, copy into your real tables from the temporary table. If you have a process like that, it could make sense to have the temporary table be unlogged (assuming the copy to real tables is still safe if you do that).