I don,t agree that it's not needed. I view it as an alternative way to achieve the same results.
The modification back in the day was claimed reliable to 10,000 rpm.
I am not sure if it was specifically for hydraulic lifters or not.
IMHO, the crossover is one of the solutions for oiling the left galley, all of which are better than feeding it off of #1 main. If you don't need oil in the left side, it has no good purpose.