Score and rank a bid request batching

[domfarolino]

After step 5, score and rank a bid has the following text:

Implementations may batch requests by collecting render URLs and ad component render URLs from multiple invocations of score and rank a bid and passing them all to a single invocation of building trusted scoring signals url -- the network response has to be parsed to pull out the pieces relevant to each evaluation of a scoring script.

On the surface it seems like this optional "may" is allowing for a pretty substantive change in behavior that isn't totally clear. How would this actually impact the flow of this algorithm? Would multiple subsequent invocations of "score and rank a bid" build URLs and stop short of sending the request? Which one would finally send the request? The alternative flow that the "may" offers is too vague to follow, and its web-visible implications are not clear. Can we either remove this or specify more rigorously what this is trying to provide?

Furthermore the motivation of this isn't clear: do implementations actually do this?