I think if you are going to do vinyl, one has to master.
I am going to try a concept of releasing an "album" as one file, rather than cut it up as individual. In this case, I will "master", but not like old school real mastering, where they have to rework the lower end (I understand some bottom is removed and the phone cartridge make it up), make sure the songs will fit on one side, true mastering for a vinyl release. From what little I know was very much a technical expertise.
In other words, except for loudness and sound consistency, not sure it really exist in the digital world, or it is redefined.