"few customers care" is not the democratic ideal you make it sound to be.
It's the same as glued batteries, unrepairable phones. Few customers making it an absolute criteria for their phone choice still doesn't make mean the majority sees it as a positive thing nor they agree. At the time on the android side, only Pixel and Samsung's lines were serious about the camera or international NFC support, moving to other phones just for the jack came with huge compromises that had nothing to do with the jack itself.
It’s a competitive market. If removable batteries mattered to a lot of people, some company would take advantage of that to make a lot of money.
Feature combinations aren’t immutable facts of nature. Manufacturers make a conscious choice about what to include. If a good camera and international NFC combined with a headphone jack would attract a lot of buyers, don’t you think Samsung or Google would make a phone like that to better compete?
It’s nothing to do with “democratic ideal.” It’s about understanding that companies want to make money and if a feature is desirable, they will leverage that in their quest to make money. Some may fail to understand what their customers want, but all of them? It’s not plausible.
The "???" is "hey, Apple are doing it! since we already copy so many ideas from them, let's shave a few cents on the amp and jack receptacle, and if anyone complains, just claim that it's the trendy thing to do now".
And why didn't any of the multitude of phone makers say "turns out that people actually want a headphone jack, let's spend a few extra cents and steal all of our competitors' customers"?
Almost like there were at least three other features more important.
The most important letters in English are E, T and A. I'm sure you won't notice if we remove H from all keyboards, right? After all, the survey says it's not in the top three. And given a choice between a keyboard without E and one without H, nobody buys the one without H, proving they really don't need the H.
Why wouldn’t some keyboard manufacturer realize that a lot of people actually do need all of the letters, sell a keyboard with all of them, and make bank?
This theory that people want headphone jacks and phone makers won’t provide them makes no sense. It requires phone makers to be so cost conscious that they’ll remove a desirable feature to save a few cents, yet simultaneously so clueless that they won’t take advantage of consumer preferences to beat their competition. This sort of thing happens with individual companies, but not with every single company in a competitive market with many competitors.
I don’t know why people can’t just accept that they have a minority preference. There’s nothing wrong with that. I’m sure it’s far from your only one (I have plenty of my own, just not this one). There’s nothing wrong with general complaints that the market doesn’t cater to your minority preference. But arguing that it’s actually the majority, when it plainly isn’t, it just weird.
Because a large number of “everyone” is buying keyboards from your competitors. If you make a keyboard with all the letters, you’ll get more of those sales.
No, I wouldn’t but a keyboard with a tm key because I don’t care about having such a key. Pretty much nobody would. That’s why such keyboards aren’t made. You’re making my argument for me here.
Counterpoint: if, instead of differentiating yourself, you copy Apple, nobody will fire you for that decision, even if it sucks.
Bonus: now that neither you nor Apple are including the jack, consumers resign themselves to a worse user experience and just buy your product (or theirs).