its pretty common to have the NAT gateway also be a stateful firewall (you’re tracking state, after all) but they’re not the same and you can have one without the other.
Its just uncommon in consumer or prosumer devices.
A similar allegory is perhaps industrial washing machines vs consumer ones or that printer/scanner combos are common (even in offices) but print shops and people who actually need a lot of paper would have dedicated equipment that does either scanning or copying better.
It’s also like a leatherman, they all have some commonality (the need to be gripped) so theres a lot of combination; but a tradie would only use one as a last resort- often preferring a proper screwdriver.
Its just uncommon in consumer or prosumer devices.
A similar allegory is perhaps industrial washing machines vs consumer ones or that printer/scanner combos are common (even in offices) but print shops and people who actually need a lot of paper would have dedicated equipment that does either scanning or copying better.
It’s also like a leatherman, they all have some commonality (the need to be gripped) so theres a lot of combination; but a tradie would only use one as a last resort- often preferring a proper screwdriver.