Functionality? Configuration? Data? Reporting? Integration? Process? Training? Ownership? Some enthusiastic combination of all eight? Every one of those feels identical from where you are sitting, and every one needs a different remedy from a different party. That is why the diagnosis matters more than the first fix anyone attempts.
I spent years inside Sage Software watching where these environments strain, and I now bring that knowledge to your side of the table: diagnose the environment, define the issue, gather the evidence, work out who owns which piece, and coordinate the path to a resolution that holds.