Pathfinder exploit.
Pathfinder is perfect! My respect to developers.
But, pathfinder can be even better.
The problem.
1. If alien stand behind door, pathfinder can't get direction for my unit. And I know, alien behind closed door.
2. If my unit stand at the door, alien unit never try to open the door.
The suggestion.
When pathfinder calculate the path, it should not be taken into account undetected enemy units.
For example, if pathfinder calculate the path for alien unit, it not be taken into account undetected my units and civilian units.
On the other side, if pathfinder calculate the path for my unit, it not be taken into account undetected aliens and civilians.
This will give the dramatic into gameplay. Casual meeting will be possible at the doorway, on the stairs, around the corner.
In original Xcom rencounter were possible.