Do deadllift one day, and do a back training the day before, even if you got no muscle soreness from dead, after a few set of chin/row your back will cramp everywhere and you'll realise that the deadlift the day before worked your back on an unexpected way.
Also if you can't squat because of knee injury you'll realise your squat strenght is almost intact when you come back to squat if you do heavy dead during recovery.
Deadlift is just terrific for back and posterior chain.