text: Yes, I care.  There are now numerous broken multipolygon relations here, which I'll have to heal with SCCGIS v5 data or later.  If you can't or don't or won't load multiple layers into JOSM while editing (or QGIS for reference), messing with perfectly valid data is unwelcome.  I don't know if you don't know how (I'll offer a tutoring session), or if you won't, but stomping on valid data isn't OK.
  
  If you name the way #s or relation #s, the wider community know "which?" farmland you mean.  In Santa Cruz County, farmland which has Zoning=RA ("residential-agricultural) is more like a "family farm" and can almost flip between landuse=residential and landuse=farmland.  However, if it is CA ("commercial agricultural"), those almost never have a residence on them, are usually more-intensively farmed and you could be 99% sure these are landuse=farmland.
  
  It really isn't clear how or why you say "clearly," either.  If the land is zoned one thing (zoning logically maps very close to landuse), you likely don't want to "take away" that landuse from its official designation, which is how these are tagged around here.  I've tagged/mapped/logically applied tens of thousands of these, and there are very seldom errors, but you can't always discern a landuse from imagery:  it is what the landowner and county/city council agree upon.  Our county wiki contains the back story, guidelines and this information.
  
  Saying "clearly" doesn't make it so.
  
  So, please load SCCGIS v5 data and fix the multipolygon you broke, or I will.  When done, please close the note:  it isn't "clear," (especially as you didn't look) and people do care, so now you know.