The benefits of well-cured concrete don't apply to floors that must reach a low moisture-vapor emission rate before floor coverings are installed. Because cement hydration immobilizes some of the mixing water, well-cured concrete contains less free water that must evaporate before floor coverings can be applied. But well-cured concrete also has a disconnected void system that slows the moisture-vapor emission rate. So drying well-cured concrete requires removing a small amount of water, but that water must exit the concrete through a winding, constricted path. In concrete where the duration of curing is short, the reverse is true. Less cement hydrates, so there's more free water. But the void structure of the concrete is more likely to be interconnected, resulting in larger pores that allow a higher moisture-emission rate.
If the construction schedule requires the application of a moisture-sensitive floor covering shortly after concrete placement, reducing the curing period can help the contractor meet that schedule. Curing periods longer than the ACI-recommended minimum of 7 days are unlikely to produce quality benefits that will offset the adverse effects on the schedule.