We should support Dask for the “seurat_v3” flavor. But probably after:

• Dask support for pp.highly_variable_genes (default "seurat" flavor) #2777

• Dask support for pp.highly_variable_genes ("cellranger" flavor) #2807

• sc.pp.highly_variable_genes(adata, flavor="seurat_v3") consistency improvement and implementation discussion #2792

  That one changes to the “seurat_v3” flavor