Does it make sense to paint floors prior to installing laminate flooring?
I have always painted my own subfloors. My reasoning is that what ever finished floor material I use will be more easily removed if the subfloor is painted. The carpet underlayment/pad doesn't stick as firmly, Press and stick vinyl tiles adhere  better. My biggest reason is spills are less likely to penetrate into the plywood and cause odor or mold issues later.