You may find it useful to have the possibility of swapping the lens of your mirrorless camera, depending on the type of photography you are working with. One lens will be more appropriate for portraits, while another will allow you to better capture moving details in specific situations. This is the case if you are photographing sporting events, for instance.
For this reason, it is interesting to purchase a camera body with ideal features before opting for the lenses that best suit it. While mirrorless cameras allow you to change them, keep in mind that you do not have access to as wide a variety of lenses as that of DSLR models.