The significant problem I have with the new washers is that when I just want to rinse off my knife after gunky use water gets in the perforations and hinders smooth performance. Every time. However I love love LOVE the oversized washers in my Inkosi.
I believe you are supposed to reassemble the knife with sufficient grease so the washer's holes are filled, thus you won't get water in the perforations. The washer/pivot/grease assembly is designed not only for smooth operation but to prevent corrosion.