My apologies, but I think you are misunderstanding. At v2019R2, development enabled mixed dimension analysis where 2D and 3D bodies could co-exist in the same analysis.  In other words, a body could be modeled as 2D axisymmetric in the same analysis with other 3D solid bodies. See the image below from "What's New" in v2019R2 Help documentation, where it was released.
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