I agree with you. the counter that some people make (that I personally disagree with as being a reason to not do it) is that anything that lets voters confirm that their vote was properly counted also enables 3rd parties to influence said voters (i.e. buying a vote is more valuable if one can validate that bought vote was actually delivered).

Personally I find other mechanism to heavily criminalize vote buying as being effective to discouraging that behavior and providing a slip of paper to the voter that enables them to post factor validate that their vote was counted as they believe it should have been to be much more valuable.

but its important to address the issue that some people have.