Plain and simple: You need to be seen by anyone on any device flawlessly NOW.
Make the best first impression irregardless of the individual users device. A soon-to-be released Google report reveals that over 60% of search engine traffic is now originating from mobile devices. As a result, starting April 21st, began penalizing sites that are not "Mobile Friendly" by their definition. Here's Google's tool to test your site https://www.google.com/webmasters/tools/mobile-friendly/ for mobility.