IF heaven is plot imposing then hfs is plot imposing too.
and i cant see any problem with dorfs invading heaven for profit. its not even the worse thing people have done in this game..
There is a difference between emergent behaviors and outright encouraged behaviors.
It is totally possible in this game to breed and murder mermaids in giant oceanic factories for fun, but Toady took away the giant value multiplier that encouraged doing so. Doing so is
possible, but not
encouraged by the mechanics of the game.
Digging into the candy is encouraged by the game by being highly valuable and versitile. Fighting the HFS is heavily discouraged by being a box full of clowns with abilities that bypass all defenses aside from exploitative behaviors. Defeating the clowns and colonising the HFS is heavily discouraged by the game mechanics by making stronger-than-FB creatures roam rampant and giving you basically no useful materials. For that matter, game mechanic-wise, evil biomes are discouraged, and there is code to prevent any dwarves not controlled by the player from trying to settle there.
Also consider that the boogeymen are from the shadow realms, and you
can fight them as an adventurer, but everything they have dissolves into mist so you can't profit in any way but combat experience points from fighting them, even
if you're strong enough to survive such fights.
Players
can do those things for fun, (or Fun,) but there isn't any explicit encouragement in the code to do so, (and plenty of coding reasons
not to,) and that's something you need to pay attention to.
If divine realms are accessible, (because most gods are not fluffy-cloud-heaven-type deities, but are ocean gods or mountain gods or whatever,) then their
intended purposes for being there should probably be for either peaceful communing or else being some sort of terrible threat to players first, and a potential source of loot only as a side benefit. (In fact, Toady might well make divine metals cursed if wielded by dwarves, and have them directly harm any dwarf that tries to manipulate them if he feels it too warps the intent of the game.)