Your writing is excellent. The grammar is almost flawless (see below). Beyond that, I enjoyed your writing
style as well -- strong opening, thoughtful variations in paragraph length and sentence structure, and generally concise and focused.
If you are interested in some small feedback to improve a little more: the final three sentences in the article were the only ones where I saw something that could be improved.
> I have already argued in the past that I prefer this iPhone model over any newer one, Face ID capable.
I'm pretty sure this is grammatically correct as-is. (English is funny like that...) Having said that, the more natural-sounding way for a native-speaker would be to lose the appositive and avoid trying to turn "Face ID" into an adjective. So it would be something like: "I have already argued in the past that I prefer this iPhone model over any newer one with Face ID."
> It is perhaps the closest to a perfect gadget I have ever used — no wonder, it is the third “same” device I buy in seven years (before, the iPhone 6S in 2015 and the iPhone 8 in 2017).
I'm pretty sure the verb tenses are technically correct, but the last bit is not how a native speaker would write it, and there's an extraneous comma. Instead of saying 'no wonder, it is the the third "same" device I buy in seven years,' a more native-speaker way of writing it would be: 'no wonder it's the third "same" device I've bought in seven years.'
(EDIT: I was thinking about this a little more because something about the sequence of words "third same device" still didn't sound quite natural. Iterating, I think it could sound even more natural like: 'no wonder I've bought the "same" device three times over the last seven years.')
> If, despite all the rumors, in five years there is a “5th generation iPhone SE” with this same look, but updated internals, it will most likely be my next phone.
This sentence is solid and native-sounding as-is. A professional editor, though, might object to the overwhelming number of commas (even though all the commas are grammatically correct!). They might suggest eliminating some of the repetitive clauses and moving things around a bit to make the sentence flow more smoothly. The end result might be something like this: 'If, despite all the rumors, there's a "5th generation iPhone SE" in five years with the same look and another round of updated internals, it will most likely be my next phone.'
I hope that's all helpful and not too nitpicky. Like I said, your writing is fantastic as it is! I'm looking forward to reading more.