Azure AD Connect Health Agent for ADDS should use the OMS agent
Rather than requiring a separate agent install, leveraging the Microsoft Monitoring Agent would be appetizing to customers looking to minimize their agent footprint on DCs.
Thats would be great. Beside reducing footprint on DC's the Agent registering logic is awfull.
You are in real pain if You have core DC's and require MFA .
Also it is impossible securely deploy it automatically ( for example with SCCM) without including registering user credentials in plaintext script.
At leas consider using accesskey method ( like in Azure ATP agent)