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Huh?? Wtf!?? What’s wrong with an address or phone number? It’s worked for years! Are @RoyalMail going to abolish addresses and post codes on the back of W3W???!! 
Not everywhere in the world has a traditional address, and in this instance of being on the beach it can be difficult to describe exactly where you are. a what3words address describes a precise location, and has been used for many real life rescues: https://what3words.com/what3words-for-emergencies-real-life-stories/ …
A phone number should suffice... and if an exact location is needed and an obvious location isn’t possible (like on a beach or in a forest etc) then what is it W3W does that a traditional @OrdnanceSurvey grid reference doesn’t??
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Sun, sea and safety 
