Histograms are exposing only the percentiles, min/max/mean/stddev are missing, and there are situations when these are needed.

Example: SSTablesPerReadHistogram. I like to see the average of it, but P50 is not the same as mean. P50 will show the value of the median sample, and since these values are integers it can be quite different from the mean. In my case the mean was changing from 0.3 to 0.75, while P50 was 0 all the time.