Yes, but only more power for short periods. Power meters also show us that smooth pedaling produces less fatigue over longer periods of time. The modern focus on crits and short TTs has changed things. It's good to be able to do both. On rollers, you can feel how what you need to do changes as you gradually move to harder gears while holding cadence. The smaller muscles give up the ghost first. The more training you have at smooth pedaling at higher power levels, the longer you can hold on to it as the road kicks up. Obviously. And thus the more endurance you'll have on a long hard road ride or race.