I agree with you. But at the same time, just giving a minimum without any context is misleading, because you don't know how often or how long it stays there. Some people are looking at the worst of the DF videos and thinking the game plays like that all of the time, but it isn't true. To go the opposite way and say those videos are not representative at all is also not true.
Which is why fps segments should be shown in context, as in how much it takes to make the fps drop to certain values. Having a distribution also helps. The way DF shows it tells you exactly what is happening on screen and what fps it correlates to, and that's doing as much justice to the game as I can imagine.