[theme-reviewers] home_url('/') VS esc_url(home_url('/')) Clarification

[Zulfikar Nore]

As this page: http://make.wordpress.org/themes/guidelines/guidelines-theme-security-and-privacy/ has since changed I thought I'd ask just to be clear I understand the requirements.
Is esc_url for home_url a requirement or recommended? This page: http://codex.wordpress.org/Data_Validation does not state explicitly that it is a requirement.
So if its a requirement - is it a must fix requirement or can it be a fix in next revision requirement?
Thanks in advance,Zulf 		 	   		  
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