There's pretty much no reason not to use them everywhere. Every construction site on the planet would benefit from augmented workers. A ridiculous amount of heavy lifting is still involved in putting up just normal buildings, and an injured worker is a big cost and set back.
Family is in heavy construction, and I think there might be a bit of a misconception on what holds workers back - its not weight.
The most common complaint that I hear is that between climbing and harnesses, flexibility suffers. Adding in an exoskeleton would probably not be the best idea in that case.
just an extension of all the work being put towards getting people who suffer disabilities back into regular life. I have seen some "suits" that help people walk again, talk about giving freedom back.