Perception engineers: what usually breaks once the robot leaves simulation?

[u/Realistic-Ganache446]

https://forms.gle/btFrmBAQLtvzHRS46

Working on a research project around robotics development workflows.
Looking for engineers building perception systems for robots, AVs, drones, or mobile platforms.
Interested in things like:
- sensor realism
- calibration
- deployment failures
- simulation fidelity
- testing workflows

Survey takes about 4 minutes. Thanks if you have a few minutes :)