Adjustable Wedge

We know, the German products frequently offer inusual features but often effective.
This is the case for a wooden jointer of my collection. It shows a somewhat particular wedge.
It is retained in position by a steel pin and has on its upper face a metal plate of which the position can be varied along its height. The plate is kept by a little screw and a washer, inserted into the wood by two nails, also used as guides. 

Two little wings avoid to the screw of touching the steel pin.
A first function has been evident: avoid that the rounded pin can damage the wedge wood and decrease its grip. But why the plate is adjustable? Playing a little bit with it I understood that in this way the wedge can be adapted to blades of different thickness and/or cap iron of different shape, providing always the optimal grip.
A relevant advantage in case of blade and/or chipbreaker substitution.