Perhaps Twitch only wish to provide game developers access to accurate analytical data on their games, and let 3rd parties only have an approximate. Or maybe its for performance reasons. We don’t know.
Also, it’s hardly a ddos, it’s a trivial amount of requests that by design of the pagination system get spread out over a period of time.
Yes its more than v5, but those who need an approx number of streams/viewers can still get it if they choose. If this is too much work for you, feel free to vote for a feature request on UserVoice and explain your use case and why you can’t paginated and sum the results.