[LocalPCGuy]

I think you're trying to make a very nuanced point, and I tend to agree that there are different needs for different viewport sizes. But I think it's important to note the difference between the design and the technology to build it. The technology should, IMO, as much as possible, seamlessly switch between the various layouts when it makes sense from a viewport size perspective. Definitely don't want, IMO, to deliver completely different sites based on device type/site from a technological point of view, we've tried that before and it isn't a good idea.

I also think one of the things good designers do is to take this into account, and make pages that are built up of components that work at various sizes, not just scaled up from mobile. In addition, a good designer will setup the page design such that it can scale up and down nicely from one viewport size to another.

So, while I don't 100% agree that you need "individual" designs for each, I do think you need a designer that takes the different viewport sizes into account and provides the appropriate adjustments for each. And developers that are skilled at then building those pages.