I think the whole overall point of the safety tips was to save weight by having less structure in the outer wing tips
As the aircraft was designed for the interceptor role weight saving was sought to maximise the rate of climb, the savings came by being able to reduce the size, and hence strength, of the spars etc inboard of the detachable portion, the detachable wing tips reduced the leverage being applied to the inboard/wing root areas. The weight savings was given as 230 pounds. The aircraft was 2,000 pounds lighter and had a 30% higher climb rate than its predecessor Hellcat despite using the same engine.