According to Microsoft’s official page, the new storage requirement for Windows 10 version 1903 will be increased to 32GB for both 32-bit and 64-bit versions. In comparison, that’s double the requirements for the former version, and 12GB more than the latter. The page doesn’t explain Microsoft’s decision to increase the required storage capacity. However, some Windows 10 users are suggesting it has something to do with a new “Reserved Space” features for future updates.
It is unlikely that the increments will actually affect the systems of consumers. Given the storage capacities that most current HDDs and SSDs possess, as well as our growing dependence on the cloud storage platform. (Source: Microsoft via Hot Hardware)