If it isn't better or equal to legacy MMC tool, THEN DO NOT BOTHER
If you are trying to replace existing tools, then you MUST AT LEAST provide the SAME or BETTER functionality. There are a myriad of examples, but just for the sake of argument, I can open the original MMC for Active Directory Users and Computers and see far more property details than are exposed in the new Active Directory extension to the Windows Admin Center. A way to make the new extension BETTER than the original MMC would be to expose the Extended Attributes tab when searching for an object. (The legacy tool has this visible only when an AD object is selected from browse; inexplicably not available when using the Find option).