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Why save it locally when it can trivially be streamed?If you usually have a network connection, then most of the time streaming is fine. However, not everybody does. About 50% of the time I'm not home, I have little to no service, and even sometimes when I have a strong signal, it will randomly just stop working unless I toggle airplane mode off and on to reforce a handshake with the tower. If we all lived in a big city then sure we could probably make that assumption, but some people live in Wyoming. With local storage I can download high quality FLACs from Bandcamp and get higher quality without having to even think about whether I'll have service. Offline playback of music is a feature the original iPod had!
> Why keep your entire photo and personal movie collection on your portable device which can get lost and broken when you can just connect back home and access even more storage with higher reliability anytime, anywhere?
I would guess most people have more than 100GB in personal photos and videos, so even for the average use case this seems wrong, but especially for people that record much 4K video, you'll run out of space very quickly. Those files can easily get multiple GB in size. If you're on a vacation where you have little or no network connection, you'll have to downgrade your video quality or limit what you record. How is that better? If there were an SD card slot, this is a non-issue because you can bring as many SD cards as you need, and swap them out as they fill up. Can you do that with onboard storage? Then it's not a replacement/obsolescence, it's just a feature removal.
> I don't understand what you mean about "spyware built in" for Bluetooth headphones. All my Bluetooth devices do not have any other kinds of network connectivity, they don't phone home or anything like that. There's no app or anything like that needed for them.
That's great, I'm really happy for you. But some bluetooth headphones do have spyware (especially some of the best ones in some people's opinions). If it requires you to use a special app to pair and/or access features, then it (probably) has spyware in it. Bose is a great example (or at least was, maybe things have changed). With a physical head phone jack, there's no pairing required and there's no way to force you to use their software. That's a hell of a feature IMHO.
That you don't personally have a use case for a headphone jack, doesn't mean it's obsolete. There isn't a replacement for a physical headphone jack, only alternatives with different pros and cons. If that were the criteria, then the M3 macbook would be considered obsolete because I don't personally have a use for it.