No expertise here, but long experience. Back in the bad old days of primitive valve springs and the first hydraulic roller cam lobe technology, it was a bit touchy to run solids on a hydraulic profile. With today's fast action solid lifter profiles, they have little to no lash or clearance ramps built in anyway. Not as great a difference to begin with. Better valve springs are a huge help in getting away with this.
My question is, since a camshaft is such a two-dollar item in the overall cost of a performance engine today, why would anyone want less than the best possible cam profile and performance?
Studebaker-Packard V8 Limited