My lathe is a 1950s Atlas 10x60. The Atlas design doubles the leadscrew as the power feed screw. It hangs right out in the open, for rust and swarf. By the time I got the lathe the screw was noticeably worn; despite my best attempts to preserve it, it's now worn to almost a V thread.
I could thread something long enough to hold in the steady rest, over an unworn portion of the screw, but it's all enough of a hassle I'd as soon avoid it.