How does a solid roller cam act vs solid flat tappet

I think why people feel Stoker/large displacement engines shrink cam size, cause most large displacement engines are harder to feed "head cfm".
Take the average street strip cam probably gonna fall between 240-250 @ .050" and make peak power around 5700-6300 rpm.
If you look at head flow, cfm probably gonna be around 70% of displacement for that rpm. 273 = 190, 318 = 220 cfm, 340 = 240 cfm, 360 = 250, 390 = 270, 410 = 290, 440 = 310. A 245 @ .050" is gonna have a similar powerband for each of those cid:cfm combos but most are running and out of the box Eddy head maybe with a bit of port work on a 340-416 cjd engines so the larger displacements are starving head flow making the cam act smaller and move the powerband to a lower rpm.