If there are multiple invocations of endpoints, this will be expensive to deal with for vendors. We have to pay per function call with Forge/lambda, and Atlassian shoves extra costs on us.
A second, and possibly more urgent concern is about rate limits. If our functions get called multiple times per invocation, our apps hit rate limits much faster. And there is nothing you can do about this as a vendor.
I think Atlassian should deliver a better architecture for us vendors and developers.