That's not a reasonable assumption.
If they had manufactured an alternative iPhone 7 (that was thicker than the regular one, or whatever was their rationalizing for removing it) then we could say that anyone buying the alternative one was communicating their want/need of the jack.
There is significant platform lock-in between iOS and Android, and while you can always switch, there are a lot more factors than the headphone jack, making it - without a gradient - impossible to draw any such conclusions from the data points available.
I've had an iPhone since the 4, at first because it was the best phone by a long way imo. Now? I imagine switching and would rather pay the premium not to go through that hassle.
I'm super sad that I'll have to use a shitty adapter to have semi decent ear buds (I use sennheiser cx-500 most of the time) - but again not enough to motivate switching. [I've not looked but assume Sennh don't make compatible headphones]
I own the 7S without the headphone jack and while most of the time I'm fine without it, there are a few instances (mostly on planes or long car) where it really pisses me off. But switching to an alternative device that has a headphone jack would piss me off even more due to other things.
I look at it the same way about the removal of the physical home button from the iPhone 7S - 'train' users/press prior about the potential negatives so you can control more of the conversation when the 'next big phone' comes out that you want make sure makes a good, big impact.
Seems reasonable, but if the next iPhone is the massive redesign everyone is expecting, wouldn't have been easier to remove the jack and play it off as a requirement of the new design? "This is the iPhone of the future," etc.
Or you know, they have rather good reasons for it.
Like better waterproofing (Samsung always fails behind iPhone in waterproof tests, and doesn't support fully even the nominal waterproof levels they say they do), thinner feature phones in the roadmap, smarter headphones, etc.
In that video, both phones are subjected to ever-increasing water depths until the S7 dies (very respectably) after five minutes at 35 feet, while the iPhone 7 continues to operate.
That suggests to me that both phones probably should have been rated IP68.
That said, while you may be right they should be rated the same, that doesn't really help OPs point. Even if they should be rated the same, the S7 has a headphone jack and the iPhone 7 doesn't. If the headphone jack is really the problem then the iPhone 7 should be way better at handling water then the S7, and yet even in the video you linked the iPhone 7 was suffering damage from the same depths the S7 did. I would argue that even if the video is legitimate it's entirely possible he just got a "lucky" iPhone 7 that didn't end-up getting fried from the little water that got in, and the S7 wasn't quite as lucky. From one test you really just can't know.
They haven't added value for their customers but they will be reducing costs for the business going forward and are helping provide a platform for future revenue.
If everyone who actually cared about it bought e.g. the S8 from Samsung instead, I'm sure Apple would get the message - and bring it back. Since people are still buying it in droves it must not be a real clincher to most people.
The S8+ has a great DAC (as tested on my range of Audio Technica headphones), still supports Bluetooth audio - latest spec, and is a fantastic phone overall, with a design far surpassing the headphone-less iPhone 7.
IMO, Apple engineers have gotten lazy. They removed the port without adding value.