Nice isolated example that tells nothing about the "hard to use" factor. We can repeat such for days without yielding reliable empirical results. The issue is t

Nice isolated example that tells nothing about the "hard to use" factor. We can repeat such for days without yielding reliable empirical results. The issue is too compound. Opinion of the users, especially repeated ones ought to be enough to justify a concern. There are too many to doubt its validity even without exact but half cooked partial numbers.