Certain jobs have more emphasis on the service, and some jobs are easier to dip in and out of. I will be doing bits over Christmas rather than taking it as a full holiday, but that just means checking email and probably a little more depending on the issues raised. I would not use that as an argument that others should do full days physically at work because that is the nature of their job.
I admire
@CaptainHaddock and wish that there were more who would do the same. However, I also believe that appropriate compensation should be paid.