Comment by ryanbrunner

I'd argue that it's impossible to have locality in all aspects. If your style, logic, and DOM are separated almost certainly you have a separation in domain - you're going to have styles, logic, and DOM concerned with "widgets" in your product and if they're separated by whether they are style or logic that means they can't be correlated by their "widgetness".

Really the decision comes down to whether it's better to separate based on style/logic/dom or on the business domain, and I think at least for web apps, separation by domain wins out in most cases.