They are more complex, but the cell type doesn't matter as much. In fact, there are bacteria that cause disease using HGT (https://en.wikipedia.org/wiki/Agrobac

They are more complex, but the cell type doesn't matter as much. In fact, there are bacteria that cause disease using HGT (https://en.wikipedia.org/wiki/Agrobacterium https://en.wikipedia.org/wiki/Agrobacterium). Modification of those bacteria is how you get low-cost plant genetic engineering.