One problem I see is that a lot of that page generation being moved to the client increases the first time page loads (which matter) and on a mobile device can prove very taxing on 3 - 4 year old hardware.

I think it is more about do you want to figure out the html in JS or something else, and do you want to pay the bill to make the pages at home or lose some customers who don't have the power to do it themselves.