Hello everybody,
a new plugin is available for the latest Canon cameras (for example: 90D, 250D, 200D_II) which also support the latest mirrorless (RP, M200, M6_II).
http://www.msb-astroart.com/
About mirroless or DSLR for generic use, last year I summarized:
Advantages: the lack of the mirror and the viewfinder means less weight, space, vibrations and noise.
Disadvantages: the lack of the mirror and the viewfinder means a less intuitive pointing (because you need to look at the LCD) and a higher battery consumption (because you need to turn on the LCD).
For astronomy, these disadvantages are less important, so mirrorless are now a viable choice.
Clear skies,
Fabio.