My opinion is the engines we use still have a jacked up oiling system.
It didn’t get fixed until the R3 and Ritter blocks.
So any engine making any power and shifting at 6000 or higher should have them. Over 8000 you have to do other stuff to make them live.
There is no reason not to run them. I do not now nor have I never believed that you give up too much bearing area.
I’ve never seen a main bearing fail from lack of load bearing area.