A watermill wasn't as good, financially speaking, as a windmill. Watermills generally operated only in spring and fall since the water froze in winter and was generally too low and too slow-flowing in summer. A windmill could of course operate year round, and windmills are typical of the wide open Skåne plains. But Hjärsås is, as Gunnar points out, situated in a more wooded area.
Few millers - particularly those having a watermill - could have milling as their only means of income. Before it became common to grow potatoes in Sweden, around 1800, millers were often the local maker of liquor, since they had ready access to two main ingredients (water and grain). When potatoes were shown to make just as good liquor, millers would often continue as the local destillers since they had both the means and the know-how.
Before WW I wheat wasn't grown in very large quantities. In the south rye dominated and in the north barley (Swedish farmers thought they couldn't grow rye very far north while nobody told the Finnish farmer this - so the Finnish farmers successfully grew rye in the far north). Oat was a specialty of western Sweden. Already by the late 18th century oat was exported from Sweden - to England, and in particular all the horses needed in London were fed Swedish oat!
As for social status, I'd say a lot depended on the individual farmer and miller. A farmer with a good-size farm certainly outranked a miller, but a farmer with a small farm and a miller who had lots of other business ventures - well, I wouldn't be dogmatic.
My great-great-grandfather and two of his brothers owned three of the six main farms in their little village down in Skåne - and married off one of their sisters to the miller. They wouldn't have done so unless they felt he was about equal to them, and could contribute to the clan.
Ingela