I can't find my copy of "The Art and Science of Practical Rigging" but I am pretty sure they call those "kerf cuts"...they are to prevent fibers from the top from ripping down into your lanyard/safety that is just below the topping cut.
I have had Burnham caution me to not do them too close to...
We've probably all seen the video where the climber plays rag doll when the top pops.
I just found this video, they titled it "Stem Wobble". It looks like a reasonable amount of movement to me. Could it have been made even "softer" or less? maybe by changing the type/size of face cut made...
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