Carrying data on memory cards does have its potential drawbacks, especially if you travel
internationally.
The US Immigration and Customs Enforcement has the right to detain any electronic device
with internal/external memory anytime you cross the border.
I'm not sure what you are saying here.
You say that they have the right to detain any device with
internal or external memory, but you earlier said this was a drawback for SD cards. SO, if you buy an HTC 1 and have no memory card, they can still detain the device. What's the drawback of a SD card, then? How does that change any exposure to data review? So, you put all your data into the internal memory, and they look at that anyway, accepting as a given your statement of law, which I've not had a chance to review.
BTW, I travel internationally a lot. Not once has this ever happened. (Nor do I particularly have anything to hide, but that's another story.)
But they'll only find uses if it's there. They may not demand it.
There are so many things that I don't agree with in your rebuttal, this understanding of how extra space gets created and becomes a marketing tool just being one of them. Extra space gets created first and foremost by software and media makers' demand for it. They find uses for it. Like allowing consumers to bring entire movies with them. Then, there's a need and a demand follows. No surprise, most people demanding lots of space these days are people with tons of photos, videos and mp3s. Media junkies.
Your recital of how damaging it is to have SD card slots notwithstanding, the truth is that there is little downside to offering an SD card slot and quite a lot to gain for both consumers and manufacturers. And as an earlier post said, it's about the economics, meaning raking in $$$. Simply put, if someone can distinguish their devices from everyone's else's, someone will do it. And that, as I said, is why HTC is now again coming out with a device that DOES have SD card slots. Think they weren't hurt by failing to have one in the ONE? I think they clearly were. I know, despite having been an HTC customer, I automatically disqualified the ONE in my upgrade search. Wouldn't even look at it. Economics also has another slant to it that I mentioned---I think SD card space will be cheaper and easier than internal memory for a long time. Plus, when people go to buy a new phone, already expensive, and another $150 or whatever is added on to it to get the massive memory storage upgrade that they want, they may balk. Particularly when it comes all at once. Buying a card, however, that you can keep for half the price and flip into each upgraded phone you get every year or whatever--now, that's a good deal. Far more cost effective and far more efficient, saving not only money but time in setting up new devices.
I could go on, but I'm repeating myself. There are simply too many imperatives, from tech issues to market economics, that logically lead to SD card slots to ever think they are disappearing in any foreseeable future. The Apple model is exactly why I buy Android.
If you want the last word, you can have it.