So, I have to know........ (solid vs hyd)

People who run hyd cams....
well, it could be that they are not very mechanically inclined, or lazy and dont want to adjust anything hence the use of random stock length push rods and non adjustable 1.45 ratio rockers that rob them of the cam lift they'd hoped for.

It could be that they really have no expectation of valve train stability at higher rpms.

it could be they hate getting oil on their hands

it could be that they are not building anything but stock and expect nothing more than stock power numbers...

it could be that they are un aware of the faster ramp profile that solid cams give.

It is funny when a person builds, has an engine built 'solid cam or hyd' and after all that milling and changing gasket thickness and or heads block mixing...yadda yadda....that they dont at least measure for pre load/push rod length to at least maximize the performance of the cam they chose....