Or is it about the disturbance caused by other people using their phones? ...or maybe to have a plausible story to tell the people who tried to reach you? ("Sorry you couldn't reach me at the weekend, boss, I was at this island in Finland where ...").
I think this is a lovely initiative and I think it would be great if it could cause a bit of a trend.
As an Australian it's hilarious to talk to tourists and hear they're going to get a bus from Melbourne to the 12 Apostles and back, which is an 8 hour round trip, but aren't planning to spend time at the rest of the spectacularly beautiful coastline or national parks in between. The most popular tourist destinations all seem to be like that: you go there to cross them off the list even though comparably beautiful and much less popular attractions are nearby, for the sake of going somewhere recognisable.
There's nothing wrong with going to a few well known spots in a holiday, but if you just go straight from tourist trap to tourist trap you'll miss all the most enjoyable things.