My biggest issue in Apple getting rid of something that is industry standard is replacing it with something that is not. AFAIK the lightning port cannot be licensed out to other products (ie and Android manufacturer can't decide, "hey, we really like lightning, let's do that"). So, moving forward, we may see other companies getting rid of the 3.5mm jack because, as was said, Apple is the company to get something like this done [first], and I agree. So for my Android phone I might need a USB c adapter and for my iOS I will need a lightning adapter. This may even end up being true for computers? Who knows.
I am staying open minded and if the 3.5mm port is canned, I am interested in seeing or hearing what benefits the next device(s) gain from them. While I wasn't completely against the lightning port change from 30-pin, I had a feeling that I wouldn't really be benefiting from any f the added capabilities of Apple's new standard (aside from device size I suppose) and I can't say I was wrong. I don;t suspect that I will have gained anything from lightning, personally, until I buy a car with CarPlay capabilities, and barring some unforseen circumstance, that's at least half a decade away. That's not to say that lighting was a bad move, or that I think it was a bad move. But I think it's perfectly normal for a consumer to try and think of what they are losing versus what they are gaining. Since we don't really know what we are gaining (for sure) yet, all I can really think of is, at the very least, having to pack an adapter when I go to the gym. And will this adapter require me to invest more money into the iOS ecosystem while (potentially) not providing me with personal gain as did the lighting port switch? Only time will tell, of course.
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Have you used bluetooth headphones? Or bluetooth speakers or stereo airplay?
I certainly have, and for gym use, they were all inferior to my extremely inexpensive buds that I bought for $40 four years ago and have run through the wash three times and even the dryer once. I
do not expect that out of any headphones. But I point that out because, in my case, I will have to spend more money on a product I (currently) like less (of course new products are always hitting the market) and that will almost certainly stand up to far less abuse.
I even started a thread here on MR for people to recommend me some buds. I tried a few, the most memorable being the jaybirds, but they just didn't stay in my ears through heavy sweating in the gym. My wired yurbuds virtually never fall out, but if/when they do, they are also connected to something and don't go flying towards the treadmill, or under hundreds of pounds of weight, etc.
The most intriguing new product I have seen were individual buds that are apparently even good enough for swimming with. I am definitely looking forward to trying those. Even though they only have an estimated three hour battery life, they'd work for me. The $300 price tag is going to mean that they will have to be damn near flawless though, for me to keep them. One of those dropping out is even worse than what's currently on the market.
All that said, I can respect those that are ready and willing to lose the port. That's perfectly fine. Your needs and wants are obviously different than mine, and there is nothing wrong with that. As mentioned above, maybe we will gain something that I simply on't see yet that will make the trade-off more than bearable.