But don't get me wrong, shooting ML RAW is awesome. It is just not as user friendly. Personally I do love it and enjoy working with it.
And if you know your camera and settings that work, then it can be reliable enough..
Main limiting factors for more or less serious work could be:
Card full, because sometimes you can forget how much free space left.. free card space indicator only show you the real number after you reboot the camera. So if there is no space left, recording will just stop, but file saved.
Sometimes recording can stop for various reasons, but it is rare unless you are trying to push it to the max resolution/write speed, etc.
Playback of recorded raw files in camera is very slow and low resolution.
Experimental builds can sometimes crash, rarely but it can happen, and sometimes you will need to format the card. If you have only one card with you, and no laptop - it will be completely useless. I don't know what camera/build/card combination can cause this behavior, maybe it is something very specific and you will never encounter this problem.
And obviously RAW footage takes a lot of GB so you probably need at least a couple of cards and maybe a laptop where you can copy everything.
HDMI preview doesn't work in all modes, so it is hard to share the screen with others. But it is a work in progress, maybe HDMI support will become better in the future.
And overall not so simple process, not really critical, but if you need to keep in mind 1000 things at the same time (lighting, framing, focusing, movement, and always check if everything is OK in the frame and on set) it is not so easy
