A powered approach shouldn't be any "flatter." A standard glide path should be used. Vary it with flap use, slips, etc, but don't fly flat simply because you've got power.
Whether you're flying a flapless glide or a full-flap power on approach, your arrival to the runway should look remarkably similar each time.
Not how I was taught to do approaches on my IMCr course, not least because it would take about a day and a half to come down the approach with full flap.
Never overlook the possibility of having been taught incorrectly.