Agreed. Learning Sinatra means learning Ruby and not someone else's abstractions (or DSL or whatever you want to call it). With that knowledge gained one might

Agreed. Learning Sinatra means learning Ruby and not someone else's abstractions (or DSL or whatever you want to call it). With that knowledge gained one might stick with Sinatra, or even move to Rails with a better understanding of and appreciation for what the framework offers. Either way it's a win.