TLD Universal Acceptance
Based on practical operational experience, not all systems (e.g. browsers, spam filters, registration databases, user profiles, ISPs, etc.) work seamlessly when new TLDs are added. Users may experience failures in resolution or other issues with newer TLDs, which in turn impacts consumer trust on the DNS. The issue of the Universal Acceptance of TLDs (Top-Level Domains) is critically related to the introduction of new gTLDs, as well as the introduction of IDN ccTLDs.