Disclaimer: I am not a professional photographer nor formally studied photography, and have never used a DSLR, but I have been using mirrorless cameras (Sony NEX series) since 2011.
While there are generally less "native" camera lenses for mirrorless systems, one less well known/publicized advantage of using them is that you can use film camera lenses. While you do not get autofocus and there might be vignetting at the corners (which I personally like anyway), you can get a good quality lens for a good price by doing this. It also can be cool if you are trying to recreate a "vintage" look, or just going for something weird or unusual. All that is required is a cheap adapter that you costs around $5 on ebay. Two of my personal favorite lenses to use are the Jupiter 9 (the whole Jupiter series are Soviet copies of Carl Zeiss lenses) that I got for $175, and the SLR magic 3517E which I got for $37. This video has a general overview: https://www.youtube.com/watch?v=aQLi4g-wyDA
While there are generally less "native" camera lenses for mirrorless systems, one less well known/publicized advantage of using them is that you can use film camera lenses. While you do not get autofocus and there might be vignetting at the corners (which I personally like anyway), you can get a good quality lens for a good price by doing this. It also can be cool if you are trying to recreate a "vintage" look, or just going for something weird or unusual. All that is required is a cheap adapter that you costs around $5 on ebay. Two of my personal favorite lenses to use are the Jupiter 9 (the whole Jupiter series are Soviet copies of Carl Zeiss lenses) that I got for $175, and the SLR magic 3517E which I got for $37. This video has a general overview: https://www.youtube.com/watch?v=aQLi4g-wyDA