Aside from simple look, what's the difference between Scrub, Rocky, Boggy and Enclosures? They are all rough, all rounded and none of them have any specific rules applying to them (that I've found). So why does Arable terrain go to great lengths to tell me I can have Scrub, Boggy or Enclosures but not Rocks?
(And why do Enclosures have to be rounded anyway? Plough doesn't have to be, and Enclosures aren't a lot different. By allowing them straight edges Enclosures would at least have one point of difference from Rocks, Scrub and Bogs.)
These items were discussed at length during development.
Here is an example...
From a Play tester... Plenty of enclosures without straight sides, even ploughed areas. Neglecting that many areas didn’t use the standard we are all familiar with (look up the ‘Run-rig’ system) – most enclosures would follow natural features such as a hill slope, a small stream etc. The enclosure itself could be brush, hedge, thorn fence etc. For an example of rice fields there are plenty of pictures out there of semi-circle or elliptical rice fields on hill-sides. Straight lines tend to be an artifact of modernity.
Phil responded: Enclosures come in all shapes and are small, so the boundaries are more important. Typically, a farm house has hedged paddocks close to it, for working animals to graze. Ploughed fields can be separated by low walls or hedges, by ditches or by paths. The area of hedge or wall is minute compared to that of the field and they can be easily scrambled over with no appreciable delay if on foot or jumped if on horses (such as by a fox hunt)! The only hedges that were major obstacles were parish boundaries.
Phil was envisioning enclosures to be areas of many small separated fields. While individual fields could have a straight side... the entire area defined by the outer perimeter would not.