Hum... I can't say I have the same problem. I do 95% of all global corrections in Lightroom (ACR would apply since they have the same rendering controls).
What's that got to do with input profiles? Can't you build a custom rendering preset in ACR that accomplishes the same thing? IOW, you could use a profile or you could just tweak the rendering controls as you wish, save it. Not at all different from scanning too (I used to build presets that did alter curves and other tweaks in FlexColor when I used an Imacon).
I see the need for rendering controls that produce a desired appearance that you can save and use often on other similar files. The same could be done with a profile but when the rubber meets the road, what's the difference? A LUT, a Profile or a set of metadata corrections.