After doing research on AD DS and setting it up in our test environment, I feel that AD DS is what we are looking for. Other options considered were the extension of on-prem AD DC into Azure Cloud by creating an instance of DC in Azure cloud and connectivity to internal DC over VPN.
My question is that once I configure AD DS, would there be any impact on any applications, services or identities if I decide to delete the AD DS namespace later? Is it something that is not reversible or cannot be deleted once AD DS is configured?