When Google announces an algorithm change, it would be unwise to ignore it. Their blog on 26th February about a mobile-friendly algorithm roll-out on 21st April certainly falls into that category. Google and all search engines want to deliver the best results to their users. If they don’t users will switch and their market is gone. Therefore with mobile devices now accounting for an increasingly high proportion of searches, it’s understandable why Google wants to optimise their results for users on these platforms.