If by
soon they mean 2-3 decades from now, sure, I completely agree.
The iPhone 7 and 7 Plus are IP67 rated, that means water-
resistant up to 3 feet (that's 1 meter for the non-Americans) for up to roughly 30 minutes. Any phone rated IP67 will match that so, I don't know what the idea behind your saying the iPhone 7/7 Plus "do it deeper" since that's somewhat silly to state (I'm sure you'll offer up some video on YouTube as proof) because any other phone rated IP67 will offer the same level of water-
resistance.
In the past I owned a Samsung Galaxy S4 Active, the first consumer smartphone that had an IP67 rating. It had a removable back (with a water-seal on the inside) and a cover over the microUSB charging port (a flap of rubberized material) - the headphone jack had no such seal, it was always completely open meaning I didn't have to remove any kind of cover to plug in headphones.
I point out the GS4A because one time I was at a pool with my Wife and the phone was laying on one of our towels. When my Wife grabbed her towel, the phone slid off into the deep end of the pool, the 12 foot end. I didn't notice because I was swimming at the time in the middle, goofing off and splashing her so the waves were distorting the water around me and I couldn't see the phone about 30 feet from where I was situated (given the depth of the water and distance).
I got out of the pool maybe 15 minutes after she did and then noticed the phone wasn't where I thought it was, looked around, moved my clothes, her clothes, then realized it wasn't there and the only place left was... of course the pool. Sure enough I turned around, saw it on the bottom, dove in and grabbed it. Got back out of the pool, dried it off on the outside and hit the Home button (it has physical buttons) and voila, fired up just fine, no harm, no foul.
Now because the phone was IP67 rated and that states immersion up to 3 feet/1 meter for up to 30 minutes I got lucky I suppose since mine was far deeper and for less time so I beat both of those limits in every respect. I also constantly made sure the back cover was properly situated - the GS4A had one particular little point just under the camera assembly that, if you didn't press in hard enough to ensure it snapped closed, would cause the water-
resistance to not be complete. If I hadn't done that consistently that phone would have been dead 10 seconds after it went into the water.
I'm not saying every phone can do that in terms of time or depth but, the IP67 rating does have specific requirements to get it and the iPhone 7 and 7 Plus are just that - IP67 rated - and there's no reason to think that "Oh, Apple is doing IP67 better than anyone else just because they're Apple..." or words to that effect.
Besides, anyone that would
purposely take an IP67 device deeper than 3 feet/1 meter pretty much deserves to have their phone die because of water damage.