Not maintaining a separate site for mobile and desktop isn’t lazy. Having two separate interfaces is not at all easy and it has its own set of trade offs. For

Not maintaining a separate site for mobile and desktop isn’t lazy. Having two separate interfaces is not at all easy and it has its own set of trade offs. For example with two sites you now have two URLs and need to figure out which experience a browser should actually see. If I’m on a desktop and somebody sends me a mobile link, which page should I see?