We have code in 3.7 still that runs postinstall and checks that you are on a version of php > 5.3.10 and if not gives the following message

Your PHP Version Will Be Unsupported in Joomla! 3.3

Beginning with Joomla! 3.3, the version of PHP this site is using will no longer be supported. Joomla! 3.3 will require at least <a href="QQ"https://community.joomla.org/blogs/leadership/1798-raising-the-bar-on-security.html"_QQ_">PHP version 5.3.10 in order to provide enhanced security features to its users."

pretty sure this is now redundant and both the strings and the code \administrator\components\com_admin\postinstall\phpversion.php can be removed now as it is no longer possible to ever get that scenario

If someone can confirm that I can remove the code and deprecate the strings in 3.7 and remove the strings in 4