I think Magnus did exactly the right thing by creating a category for the occupation, which he can place on the profiles it applies to. The category for Träskomakare -- a catregory in the Swedish language stream -- itself is a subcategory under Yrken, the Swedish language equivalent for Professions, which is where we have all the occupations.
When one's interests take you in the direction of forming special groups, the category structure allows that. For instance, in making woollen cloth there were fullers and walkers, who stomped on the cloth in a big vat to get the impurities out. Both Fuller and Walker became common surnames. If you were curious, you could create a high category for "Medieval Wool Making" and nest the Fuller and Walker categories under it. Doing that would NOT require others to create parallel high level categories for "Medieval Boat Building" or "Medieval Sword Sharpening."
The flexibility of the present system of biographical narratives and inline sources and various categories is that you do not HAVE to do this. By contrast, to standardize all profiles with a box for occupation would then compel you to find this bit of information. For some profiles it's interesting and important information, for others, it's not. Furthermore, every single thing must be documented, and the place to do that is in the biography. So once you've got it in the biography with a good inline source saying where the information came from -- do you really need it in a special box or in the data field?
