There is no such thing like energy efficiency in crypto world .. no matter how efficient is algo, no mater how efficient is mining hw - miners will always turn on as much mining machines as allows their electricity line ;-)

in ither words .. if miner have for exampel 10kW electricity line, he turns on GPUs wich consumes 10 kW .. if he would have ASICS, he will again turn on ASICS which will neet 10kW :-) Miner will ALWAYS consume all available electricity to maximise profit - that's real truth

with asics there is just major disadvantage of centralization of hash power in hads of big companies ..