No, no wood deck will be supportive or last 20 years the way they are built today. Why? The builders use the cheapest lumber and the cheapest fasteners, such as framing nails, not even a nail made for exterior use with a shear force weight rating of 800 psi. They do not pour the footings correctly. The footings are not properly poured, nor deep enough. The footing pad is correct with 3/4 inch minus crushed rock to allow for drainage. The footing is not a bell style foot such as a big foot footing base.
The pressure treated wood is noted as not ground contact approved, but the contractor will dig a hole, drop the post in the hole, dump the dry concrete mix, add water and mix it, and set the post. This method does not meet current International Residential Building Codes (IRC).