After learning about CG-NAT and DHCP, in hindsight I’m wondering why it worked. I got a few ideas why but could someone explain?

Was it because it was all within LAN, and not remotely from outside LAN? So anything within LAN will work even under CG-NAT?

Was it because it was just the PC and the router, and doing something like sshing into PC from phone would’ve not worked? I.e, device-to-device wouldn’t work but device-to-router does?

Was it because I have both ipv4 and ipv6 (according to wifi settings on my phone), and ipv6 isn’t affected by CG-NAT?

I can’t remember exactly what the issue DHCP brings for port forwarding, remote access, ssh, etc. is but I feel like there was something and the solution was static IP or DDNS. Might’ve been a selfhosting thing? idk