There is no " #LegitimateReason " not to have a #HeadphoneJack.

The #GalaxyS5 had one and it was splash-proof and the #XperiaZ was advertised it with people jumping into lakes...

https://www.youtube.com/watch?v=1Vyy2Y2iUE4

Same for #microSD slots, real #DualSIM [ #GalaxyS2duo, #Fairphone3Plus ], no-notch display [ #S2mini ],

https://www.youtube.com/watch?v=ZpPiZiqWjyA&t=161s