I think having a dedicated project manager can really help in situations like these. Good project managers are really skilled at finding common ground between all participants by getting everyone on the same page with the project's motivations. And sometimes people hear things better from a person they perceive as a neutral party. In my experience many designers are really good at project management also, but since developers sometimes view designers as "the person making things pretty," they don't always feel trusting enough to let them take on the project management role when they feel like the lines of responsibility have changed under their feet.
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I think having a dedicated project manager can really help in situations like these. Good project managers are really skilled at finding common ground between all participants by getting everyone on the same page with the project's motivations. And sometimes people hear things better from a person they perceive as a neutral party. In my experience many designers are really good at project management also, but since developers sometimes view designers as "the person making things pretty," they don't always feel trusting enough to let them take on the project management role when they feel like the lines of responsibility have changed under their feet.