That's true, but it's also true that the inconvenience of paying $50-$100 and not having your phone for a day (and risking it being damaged) is enough to cause quite a few people to buy a new phone.

I've replaced the battery in most of my phones over the past decade, but that's because I don't like the larger form factor of new phones. Right now I'm on the iPhone 13 mini. Before that I had a 2nd gen iPhone SE (the same form factor as the iPhone 5). If I could get the form factor of an iPhone 4 and the specs of a modern phone, I'd probably be willing to pay $1,000. Unfortunately, like the headphone jack enthusiasts, people with my preferences are too small of a market segment to be worth going after.