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All decent pedals have full circle contact at the shoulder and are much less likely to cause any problems when mounted without washers.
I agree with Jobst Brandt, that there are no decent pedals, because the interface lacks a 45° chamfer. From this vantage point, pedal washers offer a barely significant improvement...
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there are no decent pedals, because the interface lacks a 45° chamfer
Well, there's that, but it's not going to change.
I think Truvativ's roots in the OEM business makes them wary of the horrible pedals which come with OTP bikes, with wrench flats which extend to the shoulder. All decent pedals have full circle contact at the shoulder and are much less likely to cause any problems when mounted without washers.