That's the way I read it, although I don't understand why they're focusing on installation. That seems like choosing a car based on how long it takes to change

That's the way I read it, although I don't understand why they're focusing on installation. That seems like choosing a car based on how long it takes to change the oil. I'd be more interested in a benchmark of how much slower it is than having the right version of Ruby directly in your path, or versus rbenv shims.