I was shopping at a big box store this weekend. When I parked the car, I noticed something very troubling. The facility received a landscape remodel several years ago, however, no one had been instructed to remove the straps used to secure the trees when they were planted. Now, all these years later, the straps where girdling (restricting) the tree.
You can see the tree is actually skinnier below the straps than above.
(Note: I spoke with store management and he indicated he would talk to the gardeners.)
With fall comes a perfect time of year to plant young trees into your landscape. Conventional wisdom has changed over the years regarding supporting trees when planting. I would encourage homeowners to consult their local extension cooperative to determine best practices for your area of the country.
With that said, a tree grows a stronger root system and develops trunk taper when the tree is staked properly. A little movement when the wind blows can be a good thing. Remember to remove the straps once the tree can stand on its own.
UCCE Master Gardeners has a good page to consult.