The really amazing thing about DSLR vs Mirrorless, is that only forum geniuses consider DSLRs and Mirrorless cameras to be two totally different types of cameras (in my opinion, of course). I must be stupid, because for many years now I have considered them both to be just a slightly different type of camera. I have owned both, I think my first digital camera had an EVF in 2003 or so, before I bought my Canon Rebel ( the original digital rebel). I can't really remember if that first digital camera had an EVF or OVF because, unlike most forum geniuses, it didn't really matter and I hardly took notice. Like most people, (I assume) I look through the viewfinder to compose my photo and then I press the shutter. I rarely think much about the viewfinder, because I am thinking about the composition, silly me. Now, I know that over time, there have been some differences in the two types of cameras. In challenging lighting conditions, I do like that with the turn of a dial, I can use - and see - exposure compensation on an EVF. But in most cases, I don't need it, so I would have to say that the difference in having an EVF or OVF is just a slight one (for me, at least). There are, of course, other differences, such as battery life, but I would have to say that all the differences fall into the "slight difference" category as well.
For those non-geniuses who will be walking into - or looking online at - a Best Buy, or Target, or Costco, or Amazon to see what Canon has available as an affordable camera option, my guess is that they will care not one iota - and will not notice any difference - if the camera they pick up and look through - or buy online and look through when it arrives - is a mirrorless or a DSLR. They will look through the viewfinder to compose their shot and they will push the shutter button. They will notice the size difference between an M50 and a DSLR rebel, and may make their choice based on a size preference, but not an the viewfinder in all likelihood. So, if Canon makes a mirrorless camera in the Rebel form factor for the same price as the latest DSLR Rebels, they no doubt will, because they (I'm sure) know that it will make no difference to that buying segment if the camera has an OVF or an EVF. And my guess is that the majority of those buying from Adorama and B&H - no matter which series - don't really care that much if it is an OVF or an EVF either. I think you need to be a forum genius to understand just how different this makes the camera. For the rest of us, we just look through the viewfinder (whichever type it is) compose the photo, and press the shutter.