Due to the coronavirus pandemic, Microsoft decided it will temporarily halt development of non-security updates for Windows 10. The software giant says that starting in May 2020, it will only offer the "Patch Tuesday" security updates. Microsoft is prioritizing its resourcing to focus on security updates during this crisis:
We have been evaluating the public health situation, and we understand this is impacting our customers. In response to these challenges we are prioritizing our focus on security updates. Starting in May 2020, we are pausing all optional non-security releases (C and D updates) for all supported versions of Windows client and server products (Windows 10, version 1909 down through Windows Server 2008 SP2).
There is no change to the monthly security updates (B release – Update Tuesday); these will continue as planned to ensure business continuity and to keep our customers protected and productive.