I'd still rather have the possibility of bridges like that than not have the possibility of bridges like that. Especially if there's no good, reasonable reason to put it there. Just because it's a bug or a flaw in some procedural generator does not mean it needs to be removed or fixed, especially if it adds to the flavor of the game.
Which is why Toady One removed the value of mermaid bones from the vanilla game.
Dwarves were never supposed to harvest and butcher mermaids. The work-around that someone found and managed to use to profit off of industrial-scale farming and murder of sentient beings, because, remember, dwarves are supposed to consider many of the things that players revel in doing to be unthinkable crimes.
I'm sure he's also a little miffed by the treatment of cats that many players perform. He probably split off the "Adopts Owner" tag to just get people to stop genociding cats.
If something is stupid and pointless, and demonstrates that this is a mindless simulation
when he has clearly worked very hard to generate verisimilitude in his world, it is something he should know about.
Right now, all you're arguing is that bugs that reveal how unrealistic the game that Toady has worked so hard to try to make realistic is actually a good thing, and shouldn't be fixed.
No matter how lofty its goals are, the game is never going to be able to fully model all of the things that make humans inefficient and chaotic, especially in something as big and as convoluted as city planning.
So it's not only all-right but desirable for the city-planning algorithm to occasionally make odd decisions. Ideally, yes, it would model everything leading up to those odd decisions, but that's not going to be feasible in all cases.
The problem with this is that you are completely discounting how massive a project bridge-building is.
Miuramir just went to great lengths to demonstrate how much trouble it is for a medieval society to build a bridge, and how costly they are.
It is
not a matter of placing 1 stone for every three tiles of bridge, that's a game mechanic, and it is blatantly unrealistic. Real bridges were serious endeavors that cost significant sums of cash, and were not taken lightly.
A random road that has an inefficient path? Fine, it's stupid and gamey, but you could at least see someone clearing a dirt path in an odd direction.
A massive engineering project? No. Those were things of great import, and were done only when it would be proven to be very economically lucrative to build.