That notation is used sometimes in the literature on model alloys. This does not survive contact with engineering, where they tweak the formula to a hundredth of a percent.
That’s why this laser sinterable superalloy is really interesting.
But the field is developing rapidly and we are already talking about complex concentrated superalloys. There are spectacular advances happening right now at every level of alloy development. The fact that additive manufacturing is far out of equilibrium is a problem for now, but this could become an advantage instead with the right alloys.