How do you feel about the rise of mirrorless?
The low/night light features are cool, I think, but my "mentor" who's a professional night photographer, thinks it's all a gimmick. It definitely lowers the bar for entry in this field for people who don't do a lot of night photography. The vast majority of my shots are under full sunlight or heavy stadium lights, so it's not that big of an advantage for me.
There's going to come a time where mirrorless will reach beyond what mirrors can do, but I don't think we're there yet.
I'm also impressed by the 90D's Handheld Night Shot mode, where it can stitch a burst of shots together like my Pixel phone.
I find that mirrorless offers another advantage from its somewhat decreased weight (a result of mirrorless camera's decreased flange distance [1], for the curious): it's relatively easy to mount most DSLR-designed lenses to any mirrorless with inexpensive adapters.