https://wccftech.com/windows-10-1903-adoption-rate-sluggish/

Microsoft’s latest Windows 10 version 1903 introduced the long awaited changes to the update system. The new update offers users to “officially” delay any new update for up to 35 days. It also removed the surprise factor by introducing a new “Download and install now” button that saves users from accidentally installing new versions when they simply intend to “check for updates.” Despite these and several other features, including Windows Sandbox, it appears users remain wary of the new update.

New stats from AdDuplex reveal that only 6.3 percent of Windows 10 machines have been upgraded to the latest version, which puts it “on par with the pace of 1809 one month after its re-release.” This isn’t a good sign since version 1809 was one of the slowest moving Windows 10 versions and the May 2019 Update seems to be following the same pace.