If you stay with the same overall circumference and don’t upsize too much on the width, you should not have drivetrain or suspension problems. drivertrain problems occur when (1) the rolling resistance or rotating mass is dramatically increased, such as it is when going to the large off-road wheels and tires, or (2) mismatched sizes are used in AWD systems or on opposite ends of a drive axle.
Bearing problems, and sometimes other suspension problems, result from using “deep dish” wheels (large offsets) to bringg the tires partially out of the wheelwell for that “widetrack” effect.
Going from steelies to alloy wheels will cause no harm whatsoever of the correct wheels are used and the tire circumference remains almost the same.
Besides, you need no reason whatsoever to stick with your steelies. If you like them, keep them. Old-school hot rods often use steelies just for the look.