FEA is a little more complex than just three colors

Show me

Those are really nice. NASCAR used to run steel rocker arms to save weight. They didn't need a ton of strength since the spring rate with a flat tappet cam wasn't huge, but they wanted the least possible weight. I've seen some of that stuff before but never had any of it on my own engines. I'm not even sure if they make the Pro Steel stuff for Mopar wedge engines. I think it is primarily for the high winders and Chevy engines.
https://www.jesel.com/pro-steel-series-shaft-rockers

The range of colors is nothing more than a visual representation of the output data range – High to Low. If you don’t understand the input parameters and results – then looking at the picture is as useful as looking at a coloring book. – change the output range red can become orange, yellow green and yes even blue. But since you know everything – you should already know that …..

I'm sorry you did not understand what I wrote, but it does explain your remark.
Was your point to demonstrate your lack of manners?
We already knew that.

It would be an interesting exercise, and that is to put some rocker arms through some topology optimisation software and 3D print the arms.