When Windows 10 was released, one of the biggest things that worried IT System Admins was the pretty major change to the way Windows Updates were deployed. Traditionally, Microsoft released an assortment of security fixes and minor non-security fixes every month. Then once or twice a year they may have released service packs as fix rollups and feature improvements. This approach allowed IT System Admins to push security patches out whenever they got round to it or let computers update themselves. Then every X amount of years (or never) they thought about planning to upgrade their IT estate which would be a massive project.
With Windows 10, this all changed and this year, it changed for earlier operating systems too.