What agenda do I have ? I have none, I'm just saying using generators do not abstract async calls. The only way to do that is by using fibers. I'm not pushing for anything, i'm just saying that something like rails couldn't be written in nodejs , (and no sails , is nothing like rails in terms of complexity ).
The thing is that people are actually using Koa/co to solve this problem. I've yet to see someone use fibers as their core webapp control flow abstraction.