Generally, proof nickels should have full steps. There can still be weakness, or even damage on an impaired proof, that would preclude even a proof from being called FS, but the vast majority of unimpaired proofs should have them.
In Memory of Crazyb0 12-26-1951 to 7-27-2020
In Memory of Tootallious 3-31-1964 to 4-15-2020
In Memory of T-BOP 10-12-1949 to 1-19-2024