Hi Beth,
we implemented Platinum by example of the awesome CI/CD workshop. While we are trying it out on a daily basis, we more and more see that Platinum is going to tightly couple a consumer and his provider. Given Convey's law and having a working model with high concurrent development process on big company initiatives, this in practice usually means that a consumer may be faster in developing a new feature than a provider can actually implement it (assuming consumer and provider have aligned on a new API spec first).
This would put the consumer in a position to ask the provider to implement his new/changed PACT for him to unblock his PR pipeline.
For this reason we have the necessity to still be able to work independently. We solve this usually by utilizing feature toggles, so that the consumer can deploy his work already even to production, regardless of whether the provider implemented the feature already or not.
This comes with the drawback of loosing security from a test perspective though. We too think, that the platinum step is actually worth having, but when we roll out or POC solution on company level I think this is going to be a problem, hence we are now starting with a first POC approach to not use Platinum but rely on pending-pacts first to unblock the consumer from merging his PR.