Also would love to see the ability to shoot RAW light to an SD card, this would be amazing. Seems like if the C70 is able to achieve this then why not the R3?
I think you are asking the wrong question. It is not what the R3 can achieve, but who is the target consumer of the R3 and the C70?
Maybe the features you are asking for are not in the R3 is because the R3 is a stills oriented camera with a target consumer that shoots sports and action. As I believe someone else mentioned, Canon likes to target a more specific consumer for their individual cameras. Clearly, this does not please the people who think every camera should have every feature, but it seems that Canon's philosophy has served them well so far. One of the "philosophies" that Canon mentions often in regards to their cameras is making them easy to use. To a certain extent, streamlining a product for a more specific target consumer seems to be one way to accomplish that.
It reminds me of when the M50 (I think that was the model) came out without 24fp video mode. Video shooters were outraged and complained to the point that Canon eventually added it with firmware. Personally, I believe that adding 24fp probably confused far more buyers of the M50 than were satisfied by the addition. The M50 is an entry level camera, that is targeted for those wanting a small, light camera that is easily taken on trips, family outings, etc. I wouldn't be surprised if 90% or more of M camera owners don't shoot video in anything but the default mode. The M cameras are obviously not the camera that is targeted for advanced video shooters looking for that cinematic look. I have shot some video over the years, some "how-to" painting videos for YouTube along with the types of video that I would think almost all M series shooters would shoot - family events, kids and dogs playing, etc. When I started shooting video, I just wanted one choice - the default - to shoot in. I didn't want to have to learn what the difference between 29 and 24 fp is. I don't want a mode that takes a still every few seconds (The default on my Olympus camera for some God forsaken reason), I don't need 4K, I don't want 10 different modes and setting to choose from and have to consult the manual. If I want all that, I would choose a camera that was meant for video or a more advanced camera that was somewhat of a hybrid.
So, yes, some want it all, and some want it simpler. Yes, it might make it more difficult to choose which (if any) Canon camera you want, but that's the way it seems to be at the moment.