oh wow, I made a sweeping generalization - apologies. In single cell, bulk RNA-seq, ATAC, ChIP, I'd say that there are more R packages for the analysis of these omics than Python packages.
Both are under active development and are used in several transcriptomics atlas projects, as far as I can tell.
Look at the packages now for integration, pseudo time, pseudobulk - R (and therefore Seurat) dominates heavily