Microsoft’s insistence on a specific registry key setting for offering the updates on systems appears to be the issue, security vendor Barkly says.

https://www.darkreading.com/vulnerabilities—threats/survey-suggests-many-are-still-waiting-for-spectre-meltdown-windows-updates/d/d-id/1330812?_mc=rss_x_drr_edt_aud_dr_x_x-rss-simple