I'll put a view on this from the Emergency Services side. We use this in the Coastguard as another means of identifying a location. When we receive a call out, we get a set of details provided to us by the ops room. Regardless of what the caller has said, the ops room will always, 100% of the time give us a 6 figure grid ref to RV at. All of us have an OS mapping tool provided anyway, so finding location by that is easy enough, and we all know how to read a map.
If the caller has provided a W3W then we will also be sent that. However at the ops room end they will also have converted that into a 6 figure grid as well.
We'll also usually get a descriptive location - eg "RV with police at the doughnut shop on the pier....".
What we find is that there is a definite age split. We only really tend to get sent a W3W location if we're called to a younger person - generally the "more mature" people don't use it. This also goes for the age split in the team - the younger team members will happily navigate to the location using W3W, whereas, being in the older category (!) I default 100% of the time to OS maps, as it's what I'm used to using walking across Dartmoor.
Regardless, the more info we get, the better chance we'll arrive at the right place !