I suppose the elastic cuffs are some help or assurance......but, there is that thing called "Murphy's law". If you are counting on awareness to avoid a possible accident, it isn't absolutely reliable. I did wear long sleeves for a time, but I know me......and I know I can't rely on myself to always have absolute awareness. I am no longer using long sleeves when I turn. This is not to say that others cannot have better total awareness than I have....and, this isn't to suggest the elimination of long sleeves for turners.
Short sleeves are ok, and I use short sleeves, but I'd say the perfect length is just below the elbow, with most of the forearm left exposed.
Somewhere in the deep recesses of my memory, I recall some instructional material for industrial production workers.......If I'm not mistaken, this was a presentation film shown to the work crew of a lumber mill I worked at many years ago. Anyway, the message was that safety procedures can become "mechanical" in application, and severe accidents can occur when a combination of two things happen to interrupt that safety procedure. A worker's instinctive reaction to a combination of events are what interrupts a normal response that adheres to safety procedures.
After all is said and done, though......I know there are times when I live on the edge of safety when a particular benefit overrules my sense of what could be a safety problem......
ooc