@4221700 "to show up on Google searches your have to be Mobile compliant"

I've been coding a large institutional website since 1999. We were doing responsive design before it had a name, and I'm very familiar with Bootstrap, the framework Rendo uses for grid layouts/responsive design.

In my experience both directly and observationally, the place where the grit gets into the gears is when a site trying to implement a responsive design framework is being generated out of a content management system. Well-designed responsive design frameworks mandate at least 90% of how a page's underlying HTML is generated and in what order, and if the CMS isn't flexible enough to comply with the resulting required structure it can be a big mess to shoehorn one into the other.

For what it's worth, the key to all of this is accessibility because while ironically blind people won't have much use for Renderosity.com, the principles behind designing accessible sites invariably pay off in terms of overall scalability. Design for accessibility and outlining, and you get mobile compliant sites for free. It's as top-down as it gets.