Interesting Japanese climbing spikes

What advantage would you gain with these?
Well, they look really compact if one had to pack them for travel or carry them hiking any distance. Also, there is more than one spike on each of them so maybe there would be less impact if you had to use them on a healthy tree? I don't know, they just seemed quite interesting.
 
I could see an advantage on a very small stem. Like below 10". I'm always wiggly on them, because I have to have my feet so close together to press into the trunk.
On anything large though, that angle would be murderous if you spent time on them.
 
Seems awkward to me, I don’t think I’d like the spurs on the outside of my boots.
I’ve been using the cross over and under technique with my lanyard for small diameter stuff 4-10” and that’s helped with my balance
 
I was obsessed with finding a place to buy these spikes after I found that dude's youtube channel 2 years ago.
All I was able to find was some difficult to navigate, impossible to read japanese websites that had no clear way of ordering online.
https://store.shopping.yahoo.co.jp/benri-tools/zr5gt2bn61.html
I sent daigentanoen a message on youtube, but there's kind of a language barrier and I couldn't figure out what he was trying to say. I think he writes in Japanese and then the computer translates it to english, but that doesn't always translate super accurately.

He has other similar videos showcasing these style spikes:

I also stumbled upon these shortly after in a print advertisement in Arb Climber Magazine (I think?) a few years ago. Quasi-similar design,
http://www.hurseirons.com/

The concept is pretty cool, but I'm not 100% certain what the advantage of this particular design tweak is. I thought maybe it was a way to work around ascending tall, branch less coniferous trees (like cedars or pines that have been de-limbed for timber production) without having to use throwline or damage the trunk/cambium with regular tree/pole spurs? It's possible that two "pronged" spikes might minimize the damage on the tree and don't puncture as deeply. What I'm uncertain about is the lack of shank for ankle and lower leg support - I wonder if these could damage your ankles over time because of the way your ankle bends when you stand on the spikes?
 
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