I wouldn't say those set screws aren't used anymore though, VaporTrail. I used to be a sheetmetal worker and quite a few machines and hand forming tools, where constant adjustment is needed, uses those four sided set screws. They don't round off, nor do you need to be precise when putting a wrench on them, like a Crescent wrench. A lot of the machines even came with their own stamped out wrench that fit that type of screw head.
This thing may be an antique, but it could still be in use, too.
Just my useless thoughts