They are pretty objective, but you're right they are oriented around what's testable. This mostly is true in large intro classes -- specialized grad courses (we

They are pretty objective, but you're right they are oriented around what's testable. This mostly is true in large intro classes -- specialized grad courses (well really qualifiers), advanced undergrad courses with 10 students, they're testing good work. But what's testable is generally straightforward and pretty easy. So if a student can't even do well on what's testable they don't have a prayer at moving farther than that. Excepting for students with special needs, learning disabilities, etc. It's like if we wanted to test someone's ability to run a mile but had no way to measure time. We'd still test them to see if they could complete it, and if they can't, well they certainly can't do it quickly. But anyone competent can most certainly pass that basic test. Grades aren't an opportunity to show off, they're an opportunity to express basic competence.