The entire point of emergency disembarking rules is to prevent players from being able to disembark and then shoot/assault in the same turn if their access points are blocked.
As an example: This lets you do things like block a (non-assault) transport in your turn and be guaranteed that the unit can't assault you, as either the vehicle has to move, or the unit has to emergency disembark.
There is intentionally no downside for units that are forced out of their blocked (but not surrounded) vehicle.
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