In Scala basically all types are nullable (including Option/Try/Either), but it never really comes up because no one uses nulls (except when wrapping java code) because the language makes it easier to just do the right thing almost all of the time.

In fact the lack of sum types seems to be why you need everything to have a zero value in the first place: because sums are products you need a nonsensical value when the sum is the other type.