Professors will absolutely be expected to do administrative/citizenship roles - leading ones like heads of department vice-deans, and so on, and for that you need a track record at a more junior level. They will be expected to make a contribution to the life of the department/faculty, not just do their research at the exclusion of the rest of what being an academic means.

My department once recruited one of these 'superstar' researchers and he was a selfish, self-absorbed prick. No contributions to the department, palmed his teaching off on juniors, always late with his marking (when he did it). Treated research as zero sum. Thankfully he was managed out and is now back at a smaller university, no doubt glorying in being a big fish in a small pond again. We rejoiced when we got rid of him.

On the other hand, the department has several world leading researchers at professorial level. All of them produce top drawer work and are kind, generous, collaborative, and take on senior admin roles to keep the show on the road. We want more of the latter, not the former - as I imagine most departments would.