Back in the day, beds were high off of the floor for the sole purpose to be further away from the cold floor, as heat rises. It was common for a step stool to be next to the bed.
But, today, building materials and central heat make it so we no longer have to elevate our beds so they are as high as way back when.
Some older bed frames have side rails that were meant for box springs and mattresses that used to be about 10" high apiece. These days, mattresses are incredibly thick as they have toppers and are made differently. Therefore, an old bed frame may cause the new mattress and box springs to be higher.
If your bed is higher than most, you can install a duster skirt to camouflage the space under the bed, perhaps. It sure would make for some good extra storage space.