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I never suggested NAT is a firewall.
Your firewall is typically the device doing the NAT (or directly on the router if you're a home user and don't have a dedicated hardware firewall). Your firewall/router sits on the edge, exposed with a public IP.
If you desire to expose your laptop, for example, you setup an ingress rule that translates to the laptops local address, and your firewall/router translates all traffic matching the rule and sends it to the laptop.
I'm not sure which part you're not clear on.
collapsed inline media
The comment I responded to:
From my reading, it's asserting that you don't have to worry about private addressing, which is simply not true.
And from a net admin perspective, the complexity of NATing ipv4 public to private and exposing ULAs (whether you use NAT66 or NPTv6) is comparable.
If they just meant you don't have to worry about the underlying complexity of translating, that's both technically correct and unhelpful. You already don't have to worry about that.
It's this part that makes it clear to me they meant you don't have to worry about private addressing at all: "If you think otherwise then IPv6 is going to cause you some problems."
And I've explained it a few different ways in this thread already, so I don't want to repeat myself, but they are technically correct in that you absolutely could give every device a public IP, and it would be a headache to manage just like OP's example, where they give every device an ipv4 address without NATing...
No that image was for the last part of your comment "I’m not sure which part you’re not clear on."
You're right lol this image is for the person your wrote that too sorry.
From a network component perspective NAT is not a Firewall. It might run on the same device but it is entirely different function
A stateful Firewall is what provides the security. That has nothing to do with NAT. You can port forward a service or you can create a firewall exception. They both do exactly the same thing.
I never suggested NAT is a firewall.
Sure but the point was that nat allows you to choose private addresses that are by default not routed: the NAT becomes the only way internet traffic can reach your devices