You can't really compare high speed with high stamina.
I can't hold a certain bpm for very long when streaming, however saying that you can't stream a certain bpm because you can't hit more than, let's say 100 notes with 300, is kinda bull. To be honest, insanely high bpms might be impressive to play, but most of the time I see people derping so much on low bpm that it's kinda funny (for example RooM, people just HAVE to use doubletime, and get owned by OD even more, because they are unable to play slow things).
In regular conditions you will never face such things in most ranked maps. While freedom dive demands exceptional stamina, apart from the deathstream, other streams are pretty easy to click. The hard part of the freedom dive streams is the aiming required in my opinion. Often times I can steadily click but can't aim, so once you hit one note too late due to bad aim, the whole stream falls apart.
Though, here is one example of a pretty good test if you can actually stream around 230bpm:
https://osu.ppy.sh/s/38235 + DT.