A defining aspect of DF has always been how unforgiving it is. Flooded your dining hall? You probably lost a lot of good dwarves, and there's likely not an easy fix. Your favorite dwarves are dead? No bringing them back. Your adventurer took on a titan before he had a helm? No respawning, sorry, but you could pick up his corpse with your next guy. If you could mitigate such a major injury without notable cost, it would harm the "feel" of DF.
Flood gates exist.
You can't install them in the middle of a flooded area, and you then need to drain the dining hall.
It wouldn't harm the 'feel' at all. No more then having a shield block an sword ruins the "feel".
Shields help prevent injuries. This would allow you to take the single worst kind of injury, short of death, and reverse it. This should cost much more than a little time and some thread.
2. It's impossible.
This isn't exactly simple in the 21st century. How would 15th-century, tops, medical tech do this?
I am trying to find when reattachment became possible, however everything I am finding suggests that it is outright impossible to do through surgery.
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All the more reason against this.
Regenerating creatures could, of course, but regeneration in the sense we think of it doesn't exist in DF at this time
True but as said there is nothing wrong with suggesting something before it happens.
Well, yeah. My point is, we don't really know what creatures will even
have regeneration. Hydras, probably; others, we don't know.
Heck I could imagine the Bronze Collosus just pressing his broken arm to the joint and it fixing itself.
That makes one of us.