No, a mirrorless camera system does not require special software for editing photos.
While some photographers may prefer to use sophisticated editing tools, most of the image quality adjustments can be handled directly from the camera itself.
Many modern mirrorless cameras are capable of producing highly detailed images with minimal post-processing.
The quality of the photos produced by these systems is often comparable to those taken with a DSLR and far superior to that of a point-and-shoot camera.