Spears were approved by the CAB in the mid-90s.
I was there. Everyone got a good laugh.
At that time, I didn't know anyone who claimed to hunt with a spear.
Later, I did meet one guy who told me a couple of his spear chunking stories.
I swear there was banjo music playing as he talked.
I was there, too.
Jane Brock was on the Board at the time - the first woman to be appointed until the current (or whatever her status is now) female member - and asked the guy wanting spears approved if they (paraphrasing) would work to kill a deer.
First, that's silly since spears have been used by eons and still are used in South America and Africa. I get that folks there grow up with them but it's not like spears are something that only came along in the last 20-30 years.
Second, the guy asking for them to be approved replied to Mrs. Brock: "I could kill you from here."
He was at the microphone about 15-20 feet in front of the Board, seated at the table, and only meant it in regard to how he was proficient enough to use them effectively. There was a moment of silence and then everyone laughed. Point taken, no pun intended, about how they worked.
Biologically there's no reason to prohibit use of spears. Just because "no one does it!" isn't a reason, either. IMO the Board has prohibited a possible hunting method just because they or someone didn't like it.