I'm intrigued by this. The author states that they work primarily with "idea stage" e-commerce businesses. I can't think of a more perfect scenario for using bootstrap - building MVPs and validating the ideas. If I were him I would have my in-house developers master bootstrap, resulting in a higher output for the incubated non-technical teams.
Perhaps Bootstrap isn't a good fit for their team (there are many UI frameworks), but if you're developing each of your MVPs from scratch, I'd have to argue that your idea-to-business engine is running inefficiently.
Additionally, the out of box cross browser support that you get from Bootstrap will be a big help in ensuring conversion on an e-commerce site, without spending heavily in testing.
Perhaps Bootstrap isn't a good fit for their team (there are many UI frameworks), but if you're developing each of your MVPs from scratch, I'd have to argue that your idea-to-business engine is running inefficiently.
Additionally, the out of box cross browser support that you get from Bootstrap will be a big help in ensuring conversion on an e-commerce site, without spending heavily in testing.