i think the argument here is that the engine dont leave the vehicle..   yes engine mounts will break.. as the volvo article states... but it also says end up 45degree angle within the car engine bay..

but the engine still needs to be in the engine bay..

you do know without the engine.. there is nothing there to slow the collision except the front 2 beam to hold the suspension.. and the bumper cross beam right?

only those with strengthen engine frames to overcome the newer offset impact test.. notice how many fail quite badly until driver cabin intrusion when it was introduced even though front impact got 5stars?

soft? then entire front aluminium cukup lor? 
i guess it should be a mix of high strength steel and ultra high strength steel.. to guide the deformation process..away from the cabin..

looks like the engine shot out of the car like a bullet...