When a tenant hosts an application to be used by external parties, it should ideally have a short URL. Shorter URLs are easier to be memorized and typed, which eliminates the need to log-in to access the application. Also, tenant information and other descriptive attributes are hidden in shorter URLs, and they are more convenient in hard-copy productions.
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Also, to access your own domain, a cname is required. If a cname is not available at the moment, you can use /etc/hosts in ubuntu and to Windows\System32\drivers\etc in windows to put your domain entries pointing to the local ip. This is applicable only for testing purposes.