You are right, it is a roofing hammer. They are very useful tools for wood shingles (roof and siding), also good to keep in a camper. I don’t think this should fall under white trash repairs, these hammers have been around for a long, long time.
Nope, I’ve seen these made of quality steel and good hardwood handles sold at reputable hardware stores. People have been hammering with the back end of camp hatchets for centuries without problems, and I see no problem adding a pry bar.
This is often referred to as a box tool. These were once used in grocery stores to open wooden crates. When I first saw a picture of one of these, I showed it to my dad (1925-2010) and he immediately recognized it, and remembered using one when he was younger. I now have one hanging in my garage for when I need a rough tool for some misc job.