Question

what is special about buttress roots

Answer 1

Buttress roots are large roots on all sides of a shallowly rooted tree. Typically, they are found in nutrient-poor rainforest soils and do not penetrate to deeper layers. They prevent the tree from falling over (hence the name buttress) while also gathering more nutrients.
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Answer 2

Buttress roots of an especially large Ceiba tree near shore of Amazon River, close to Iquitos, Peru

Buttress roots of a Bay fig tree at South Coast Botanical Garden in Palos Verdes, California

Buttress roots of a very large cotton-silk kapok in Lal Bagh gardens in Bangalore (Bengaluru), India
Buttress roots are large, wide roots on all sides of a shallowly rooted tree. Typically, they are found in nutrient-poor tropical forest soils that may not be very deep. They prevent the tree from falling over (hence the name buttress) while also gathering more nutrients. Buttresses are tension elements, being larger on the side away from the stress of asymmetrical canopies.