Of course but the crucial difference is that these operate using an allow list, not a block list.
If I extend the analogy, if my OS required me to block-list every user who shouldn't have access to my files then I wouldn't trust that mechanism to provide a security barrier. If my firewall worked in such a manner that it allowed all traffic by default and I had to manually block every attacker on the public internet then I wouldn't rely on it either.
My own analogy is that this it a bit like saying that you want a relatively safe car and then buying one without any airbags or seatbelts, and thinking it's fine because it has lane departure warnings and automatic braking. I've got nothing against you personally, I just find this sort of viewpoint extremely puzzling (and oddly common). I make the same criticism when people just disable post-install scripts instead of using a sandbox.