The higher temperature output is a good point, you can't get 400C output for industrial processes from a 100C water based heat battery.
in any case, how would you transport high temperatures to the industrial sites? water boils at 100° and few liquids boil above 400°. most liquids will be impractical due to cost or safety (combustibility, toxicity…).
Now, in practice you _probably_ don't want to do this, because, in this case, you have district heating demand, which is a far more efficient use of the power.