T4 System plugin (1.0.0 and 1.1.3) is doing
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=yes">
."...make sure the maximum-scale parameter is set to 5 or greater..."
Also T4 is taking the section titles as role attribute but "...ARIA roles must have valid values in order to perform their intended accessibility functions...", preset mainbody, footnav etc are not valid and you can't set valid role attributes independent of the section title.