Because they gotta go all the way around the rim of the world man, just is what it is.
Rimworld
A community for Rimworld,A sci-fi colony sim driven by an intelligent AI storyteller by Ludeon Studioes
Only posts related to Rimworld
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Vanilla Rimworld pathfinding is bullshit. It gets even worse during fights, as pawns will move unnecessarily too close to the enemy, and get wrecked as a result. Or they shortcut through the freezer.
For DF-like path priorities, there's Path Avoid.
There's also a clean pathfinding mod
There's a bunch of them actually:
The second one is up to 1.4 but comments in the Steam page report it working for 1.5 too. You can either edit the version manually or use something like No Version Warning alongside it.
I'm not sure how they interact with Path Avoid, I never tried them together, it might be worth a try though.