I still think it's a neat idea, but 9 times out of 10 it's easier to use Google maps. Just drop a pin and share that. What3words is more useful when you're in the middle of nowhere and/or in an emergency situation, neither of which are particularly common scenarios.
Maybe not for you!

Nearly got badly lost a few weeks ago in Welsh hills on my bike. Couldn't find way back to a road as the satellite map on my phone can't really indicate impassable stuff.
Got back to car as sun set. I have What3words and genuinely was getting close to thinking I might have to use it.
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