So i'm a Z2 owner currently ,and im planning to upgrade to z3+/Z5 and im very curious about the z5 , im curious because sony change its policy about waterproof capabilities ,and it says " IP rating is achieved in laboratory in standby condition" and why sony change the policy? Since the z3+,in sony xperia z4 tablet,m4 aqua both have same capless usb port but in the specs page both still have IP65/IP68 & Submerged 1,5m for 30m,but not with the xperia z3+ & xperia z5 ,and if i buy the z5 can i still submerged the phone and swimming & take picture in underwater like the Z2 has, please can someone help and explain ?