Your opinion is all yours...lol. It's wrong, but at least it's your own...lol
Rocker geometry is the sweap of the tip of the rocker over the valve tip. There are only three things that affect that on a shaft rocker system: The length of the valve and seat placement (the valve job); The centerline of the shaft the rockr is rotating around which is fixed unless rocker support blocks are used (meaning factory saddles are milled off); Or the construction of the rocker (meaning the placement of the tip of the rocker in relation to that centerline of the shaft. The gasket surfaces do nothing to help or hinder. And pushrods are only connectors between the lifter and rocker. On a small block pushrods are more of an issue but only because the angles of the pushrod mean really short ones might make the pushrod hit the head at max lift if the pushrod goles are not enlarged. A big block is almost a straight shot. Adjustables are not required but shorter ones will be needed. (Best to get customs and measure for length. On non-shaft rockers that centerline the rocker rotates around becomes a moveable point because the pivots(i.e. Chevy rockers) are moveable on the rocker studs.
If you have adjustable rockers and you Mill your heads .100 why do you need different pushrods??? You have adjustable rockers.
I see this point mentioned all the time ?
With my Crane set-up i could go .200 I think?
