Are shaft mounted full roller rockers needed?

maybe a micro gain, but is it measurable and or is it just less friction-heat

i like the needle roller idea, but its one of the last things i look at in gaining anything unless im moving away from inaccurate iron 273 rockers...then its ratio gained and less friction/heat
Now the roller tip definitely saves guides from heavy side loading..
btw how many harland sharps have u seen broken and needles going everywhere?