nginx ingress vs domain (with ssl) in gke (kubernetes)

I’m building kubernetes via gke. When https communication is established using letsencrypt on the {nginx.external.ip} host provided by nginx and when https communication is established after registering a domain as a host, nginx.external.ip is set as a fixed IP If I register and use, are there no security issues compared to domain? Also, are there any issues other than readability?

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