Adding an answer because I happened to see a video on this which has a thoughtful and detailed analysis of why wood cutting / carving with an angle grinder can be so dangerous.
The video also has a "caught on video" moment of such an accident (no real gory details). IMO visualizing such an accident is very healthy mental preparation for this tool (or choosing not to).
My commentary / summary of what I got from that source:
The crux of risk, as I understand it, is this: one edge of the spinning cutter / wheel is moving in the opposite direction from the other. This means that a very small change in tool position can suddenly and radically alter the reaction force on the tool from the workpiece - it "kicks". When this happens you cannot react fast enough to counteract the almost instantaneous change.
Coupled with that effect wood as a material is fibrous and tends to grip the sharp pointed surfaces of cutting devices. This is considerably different from other materials like masonry or metal which are often worked with an angle grinder. A "kickback" type event seems to be far less likely or violent (in my personal experience) in those materials. So one's experience with a grinding those materials seems not to translate very well to using the same tool on wood.
I think the video is excellent overall but here's the key moment where the accident occurs: https://youtu.be/IIQu1e8DGUw?t=288
This example is using a carving cutter, not a circular saw type blade, but the risk seems similar.
(YouTuber: Stumpy Nubs)
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