If you are a web developer then in some point of time some client may have asked you to develop sites one for desktop and one for mobile, (probably in iPhone) with almost same contents. If you meet that client again after 2 or 3 years he will ask you to develop more than 5 sites to view it in different popular devices. I don't think it is a good solution to have bespoke designs for each device, since our device landscape is rapidly progressing. So we developers should start thinking radically to meet with this issue.