Hill repeats occupy a polarised place in training culture: some riders build seasons around them, others avoid climbs entirely. For some, it is the only way to get the necessary intensity without a track. For others, it is just random suffering that lacks a clear purpose in a session design.
There is a tendency to treat climbing as a magic bullet for fitness, but high intensity intervals only work if they serve a specific goal. Without a plan, you are just grinding a gear for the sake of a number on a screen.
Does your preference for or against hill repeats come down to the terrain you have available, or a specific training philosophy?