The monthly (quality) updates are now cumulative.
Monthly updates in previous Windows versions were often overwhelming because of the sheer number of updates available each month. Many organizations selectively chose which updates they wanted to install and which they didn’t, and this created countless scenarios in which organizations deployed essential security updates but picked only a subset of non-security fixes.
In Windows 10, rather than receiving several updates each month and trying to figure out which the organization needs, which ultimately causes platform fragmentation, administrators will see one cumulative monthly update that supersedes the previous month’s update, containing both security and non-security fixes. This approach makes patching simpler
Overview of Windows as a service (Windows 10) - Windows Deployment | Microsoft Docs
