This build was designed to work on clean install only. None of the windows features have been removed, and no cosmetics have been implemented.
The activation was base on MS procedure, for that matter, an internet connection was required during the process of installation. Net Framework was integrated.

Microsoft Office 2021 was integrated and also activated. However, there are things that we must consider.
First, a task scheduler was created to check weekly the activation and perform auto-renew.
Second, there was automation created to placed SppExtComObjHook.dll here C:\Windows\system32\SppExtComObjHook.dll
The SppExtComObjHook.dll is needed for KMS38 activation. The SppExtComObjHook.dll is flagged by anti-virus, false-positive believe me. For that reason, there was automation made to exclude the file for virus scan. You see it in the windows defender exclusion list.
Those two things I mentioned are necessary for the conduct of auto-renewal for office activation.
Nevertheless, everything is done automatically without the administrator's intervention.
During the installation process, don't be surprised if there is a certain delay, that is due to the installation of office 2021.

Checksums:
Name: Windows_10_PRO_19044.1200_21H2_Microsoft_Office_2021_x64_En-US_Pre-activated.iso
Size: 7295434752 bytes (6957 MiB)
CRC32: 9CABE29F
CRC64: D925EA366B1BCF6E
SHA256: 45EB6AFC81F862B906BBD5C65CB673C9AAD3BBFFA492F1A64AF7107304B26048
SHA1: AA608101A0F012195625C4A822A8CC3E1EE8FFDF
BLAKE2sp: 187D31DF7544E0E449A6E13B7452F66F0A295A188155B360605F95C913E267DC

https://blogs.windows.com/windows-insider/2021/08/18/announcing-windows-10-insider-preview-build-19044-1198-21h2/