Your logic is all based on the assumption that a phone that supports SD necessarily also has a smaller (read: inadequate) internal space for just apps, when comapred to phones without SD slots.
While your logic is all based on the assumption that a phone that supports SD necessarily supports SD cards big enough to hold ALL your media, and has big enough internal storage for your OS to live comfortably.
That is no more an arbitrary scenario than mine is. And that's my point. Your SD card scenario is different, and may in some cases be better, but is just as likely not to be.
I don't think that is even close to true.
And yet the Galaxy S5 really does have only 16GB storage + SD card support*, while this Oneplus one or whatever comes with up to 64GB internal. My hypothetical scenario actually exists.
Which of those 2 memory configurations would you prefer?
I don't dispute that 64GB internal + 128GB SD card support is an even better option, or that 256GB internal would be even better than that.
But if your choice is 16GB + 128GB SD or 64GB internal which would you choose? This is a real choice between real phones.
* yes in theory there is also a 32GB samsung s5... but its not actually available from ANY carriers here so it may as well not exist.
Not as far as I'm concerned. My whole point is that I have a 2 generations old phone that nothing newer can compete with, because most don't support SD.
The S3 only takes a maximum 64GB card. Assuming you bought the 32GB S3, you have a maximum 96GB storage.
There are already 128GB internal memory phones on the market. (Admittedly they are still rare.) But surely that would also be better than your S3, despite not having an sd slot.