In theory all software is coded using a "many by default" approach. So every time batching matters, we take those batching opportunities automatically due to th

In theory all software is coded using a "many by default" approach. So every time batching matters, we take those batching opportunities automatically due to the way software is coded. In practice we only batch when it starts hurting. It doesn't hurt to delete files one by one on a normal file system. It's made for that. So the API wasn't "many by default" and that's how it works for zip files as well.