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 be fine.
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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 deform already because the tang is hitting them and stretching them where the contact is made. If a wedge was used all that would not be an issue at all. The scale deformation is always present on razors with tapered tangs and a spacer, never seen one without that issue.
The goal is to have the scales parallel to the tang, then the pin serves its purpose, to keep the blade tight in the scales no matter the relative position. This is achieved with using a wedge on tapered tang blades. For straight tang blades a spacer will be fine.
Yep that is about it right there
Of course it is your razor and your scales and doing it your way is your option...
Also keep in mind it isn't IMHO, it is in the opinion of Razor Makers for nearly 300 years
Here is a thread I did on TSD with pics showing why