This is a product of over-design. Stay with me. What happens is that designers (and product managers) stress over minute details instead of seeing the bigger p

This is a product of over-design. Stay with me. What happens is that designers (and product managers) stress over minute details instead of seeing the bigger picture. So developers spend an obscene amount of time fixing iOS and Galaxy specific bugs that don't degrade the overall experience but instead aren't pixel-perfect. And as a result most other devices simply aren't tested. And instead of allowing those devices to see the site (warts and all) they resort to a whitelist of devices that can see the (QA verified) mobile site while everyone else gets either a basic mobile html site or the desktop.