Maytag mvwp575gw and Fabric Softener
The hole in the center of the agitator is where you can put fabric softener. It is dispensed when the water from the wash cycle drains out and the tub spins before adding the rinse water. I personally don't. All rinses are cold now, and fabric softener just doesn't seem to work as well in colder temps. Maybe that is just my perception. Also, the rinse cycle only agitates about two minutes once the tub is full and then begins to drain out.
Fabric softener adds a coating that can keep the water and detergent from moving through the fabric as well next time, may coat the sensors of the dryer so they may not work as well for auto dry based on moisture, and gunk up the washer. Of course, that is a generalization. Others may have no issue with it.
I do occasionally use scent boosters. They don't soften the clothes, but they can add a boost of scent that makes the clothes stay smelling fresh. Tide and Persil both have options that leave a clean lasting scent without additives.
Some have other alternatives they use that can soften the clothes. I think I've seen where vinegar can be used.