[hinkley]

An argument I’ve had a few times and wish I didn’t:

Yes, this situation only happens a small fraction of the time, but it happens exactly once to each user, and the first time they use it. It doesn’t matter what the stats say. The facts are that every user will see this problem and it will be their first experience with the feature.

[srean]

In such situations I usually ask "whose percentile are we talking about ? the percentile of the latencies of the service or the percentile of the wait time of the user ?" Then I show that for many scenarios the percentile that the user experiences can be drastically different.