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From the OP's article...
"These orders were not the cause of the flash crash per se, but they resulted in enormous damage to many unsuspecting traditional investors," they wrote.
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There are several things the SEC says the average retail investor should exercise caution with, due to the inherent risks... included in them are:
options
leveraged ETFs
If an investor wants to participate, they sign this form a says they willingly take the risk... why would the SEC force everyone to give up on stop-loss altogether?
The SEC could require anyone who wants to exercise a stop-loss to sign some form by a certain date... otherwise your existing orders get canceled.