This wouldn't really be an issue for there to still be a massive advantage to even a simple caching layer.

Imagine one has 10 request for thread {X} every second (probably a massive under estimation of the actual traffic). If you cache that single thread with a lifetime of a second you have instantly cut out 90% of your API usage for that thread.

Obviously the final benefit depends on what the actual distribution of {users} per {threads} per {time} -- but if your goal is to shave redundant API requests than it definitely makes sense, especially if the alternative is untenable in terms of cost.