@Anomie Those are some honestly impressive stats. Pretty cool. It looks like the API change isn't a problem then.

You had at least two objections at the time, and apparently you added the deprecation notice despite not realizing people were using it to make multiple diff queries.

You could be right.

Also, looking through the comment history, there are already objections in threads where the deprecation was suggested:
https://phabricator.wikimedia.org/T31223
https://phabricator.wikimedia.org/T164106

Your assertion that attempts to fetch more than one diff at a time will fail is demonstrably untrue. I was using bulk queries of 20 diffs at a time, and I fully understood the cache issue. The cache issue would affect the query only if one of the given diffs were not in the cache.