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You can never avoid friction, it will deteriorate any mechanism eventually.
What you are missing is that when you use a spacer instead of a wedge, on a tapered tang blade , then the scales will get...

I said it previously, the scales and the tang have to be parallel. That means the wedge has to have taper angle close to the tang taper angle.

By the way in the workshop tutorials I remember, in the wedge making post, being mentioned that if a wedge is made wider on one side , that side has to go on the top side of the scales. Reasons as...

What is your point here?

That is correct, rolodave and I stated it above in the discussion.

Adding washers only produces a negative bend in the scales when a spacer is used.

Look at a tang from the spine down. There is a taper angle that has to match the taper angle of the wedge, it does not have to be 100% but close as possible.

Yes I have, been restoring razors for a lot of years. Right now I have a custom razor to try, that has tapered tang and a spacer, the blade is less than a year old. The scales (horn) are starting to...

Elaborate more please. What design requirements are you referring to?

No I did not.

Can you elaborate please?

100% correct.

As soon as the tang is tapered, there has to be a wedge, period.
The scales at the tang have to be parallel to it, that can only be done with a wedge. If the tang is not tapered, then a spacer will...