Can't we actually calculate how much space it will consume? I think there are solutions out there as others have pointed out, storing remotely on servers, compression of archived video, etc. Storage costs have come way down and recording technology has advanced a lot in the last 10 years.

Like many others, I think it should be a requirement of the job. If you are on duty, it is recording. You are paid to do the job. No different than an employer recording web traffic IMO, they get to see what you are doing while they are paying you. If questions come up, they can review the evidence. If you don't like it, don't take that job.