I think the objection is not about unnecessary durability, but unnecessary complexity; you don’t need so many faces to make a glove.

Unnecessary complexity & expense, and if it were part of a mass production process you'd expect to find them clustered in production centers or something. These are found scattered randomly and individually in graves and border forts.

If the thing was for making gloves, the faces would be for different finger sizes.

The holes in them are of different sizes.