while its nice to have the fact about why this article has a few slight issues namely to do with the articles need to reference samsung phones which are in fact not that popular in japan, from my experience the majority of japanese people have one of 3 phones, an iPhone, a Sony Xperia or a flip phone, the article then goes on to say that the galaxy s5 set the precedent for high end waterproof smartphones when it was actually Sony who set the bar for IP rated phones with the original xperia Z in early 2013
also the line which mentions the s5 is talking about non removable batteries, the s5 actually did have a removable battery but there was a rubber seal in its back cover (a feature i believe first seen on the galaxy S4 active) the s6 was samsungs first flagship to ditch removable batteries