Domains enhance usability of home network as you don't need to remember IPs and ports. Most of container applications have dedicated subdomains. Also Cloudflare's SSH browser rendering feature has subdomains.
Domain related information is managed in four different places and used in various places.
Cloudflare DNS has DNS records for...
Technitium DNS has DNS records for...
HAProxy has backend configurations for...
Cloudflare tunnels have backend configurations for...