Have you found a business use case for What3Words in the Esri ecosystem? If yes, would you mind sharing a brief overview?
I found this discussion on Geonet and had similar thoughts. I also found some re-tweets re-presented in Geonet, but nothing that sounded like a non-novelty use.
disscussed here some time ago: https://community.esri.com/thread/165470
For purposes of a lively debate, I think its a fun idea. Call me old fashioned, or even just old but its academic to me...