Interesting. Chain whips were originally intended for taking freewheels apart, cog by cog, not taking off cassettes. They got repurposed because every shop had them already. 30+ years later, it makes sense that there's a purpose designed tool for it.

There were at one time chain whip alternatives for freewheels that were somewhat similar to the Pedro's tool. They didn't have the strength of a simple chain whip though, and for cog removal, you need all the strength you can get.