Hm, interesting finding, indeed.
Again I could see Kyocera is often present keeping both of these attributes. Anyway all the listed devices offering both of these attributes I could find are technically not really up-to-date and cannot even compete with our FP2 specs like display resolution, dual-sim, LTE etc.
This water**** attribute was initially, as I could read here and here, thought of in Asia where the tech addicted people in early days started to use their phone even while taking a shower having to realize that water was not the mobiles best friend.
Having such a mobile some owners do use it in water areas as they expect it to easily withstand. If it does not and fail I am pretty sure they will complaint. 