I thought I got the point across: * to allow prototyping of apps to match your own web design so that you'll always be closer to the final product rather than

I thought I got the point across: * to allow prototyping of apps to match your own web design so that you'll always be closer to the final product rather than using someone else's work. * to allow faster prototyping of commonly used elements by you (my example was the block-list, comments, feeds, widgets, standard footer). Bootstrap/Foundation does not have specifically tailored elements like that. You may find these externally as an add-on. * streamlined classes/less bloat when it comes to stuff you DON'T use. I'm not saying "create a custom framework for every project" but rather, create one specific to you and your style.