Considering they only talked about applications using low grade heat, I'd say it makes sense iff it's cheap enough, no matter how inefficient because that heat is normally wasted.
Meanwhile, nitinol actually works via a quantum property, and is sucking energy out of a sister universe.
You don't care because cheap and free, but they do! Doubly so because it sucks power at the easiest parallel source, which are (in their universe) simple copper wire.
Worse, the power stolen is 1000x of times that received, meaning they have been having significant power losses on long power runs.
This means that they have to setup more local generating power, as long power transfer from hydro dams, and clean central sources won't work.
More coal, natural gas, thanks to you! And global warming is far more advanced there.
