With a fixed capacity, someone’s traffic is going to be rejected. I think it makes sense to have a variable rate limit depending on available capacity and demand.
For what it's worth, I haven't run into any limitations while using the API side. Although I also haven't really had to use it so extensively that it would be a problem.
> Please note that these limits may vary depending on Claude’s current capacity.
Fine for the free tier of course, but not great for the paid version.