I actuallly thought of you when posting, Salmon. Iirc you've talked before about how you need to take small e-breaks every so often to keep your working rate up.
I were thinking that another thing that might be part or this is that, well, regardless of how it's regulated, people are still going to slack off and browse away anyway as long as internet isn't walled away (and, as the reportage brought up, even if it isn't people have smartphones and such these days). And if you have to constantly watch over your shoulder, it's going to make you more stressed out, and stress isn't good for work efficiency or workplace atmosphere (and a bad atmosphere is in turn bad for stress and efficiency). So having a system where people are allowed to break-browse might actually reduce their stress a little as they won't constantly have to be on their watch, which would make them perform better overall (and once more make the work environment less paranoid and stressful in turn). Maybe?
Wait, you've got surfing in Sweden too? Do you hunt moose across the frozen Öresund on a surf board, eating smörgåsbord? What else have I been missing out on?
Surfing? Tss, that's for those Californian weaklings. We put sails on our sleds and sledsail across the frozen
Östersjö at 130km/h in hunt for cute seals to club. The smörgåsbord isn't until afterwards, so we can wear funny party hats made out of seal heads for it.