Strict press carryover the jerks… from my experience there is none. In fact, one of my good friend who competed in the world championships in 1982 and held the Canadian record in the clean & jerk at one point (old 90kg class) actually had worse jerking performances when his strict press when up.
I think that it eithers stiffen the shoulder girdle or teach the body to overrely on the arms to bring the bar overhead.