ScooberJake Offline Upload & Sell: Off
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Sure, that's a pretty small range, but I can see some usefulness.
First of all, the focal length ratio of the zoom (20/16) is 1.25. That is larger than or similar to the ratios of some prime combinations that many people own/carry such as 100/85 (1.17), 50/40 (1.25), 50/35 (1.43). Also, in my experience, framing is often more critical at the very wide end, so getting 10% more image can be very important. Not usually the case with longer FL.
Many people have zoom lenses that start at either 24mm or 28mm. If you want to go wider, you have to either choose a prime (less flexibility) or often a zoom with a large overlap with your existing lenses (17-40). Some would view that overlap as waste (though some would disagree, of course). So instead, this lens stops short and gives you something else instead: speed.
Or if you shoot wide and like to use primes, this single lens could replace two in your bag. (Of course, the IQ would have to be exceptional, since that is the reason most people choose primes in the first place).
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