I do use an iPhone 6S. The hardware is fine, but I basically can't install apps because they all target newer OSes that can't be installed on it, and the older versions of those apps available are broken.
I think that's the unfortunate cycle of iOS and iPadOS. Their hardware more or less served its purpose eons ago and there's little reason why it couldn't still, aside from OS compatibility. Even as a mac user, I've only ever purchased on iOS product, and that was the iPad 3. No subsequent iPad seems to have introduced anything more compelling than what the iPad 3 was capable of (which wasn't much), so as the software compatibility story has degraded over time, it still sits here serving as an occasional epub reader. It would feel bizarre to spend thousands on a new one to effectively be able to do what I did with it in ~2012.
My android phones eventually run their course due to excessive physical damage, theft, etc.. but since I've never paid much for them, it's usually not so disruptive to just pay a few hundred and get something used or basic to replace it, or order a new screen and repair it.
My android phones eventually run their course due to excessive physical damage, theft, etc.. but since I've never paid much for them, it's usually not so disruptive to just pay a few hundred and get something used or basic to replace it, or order a new screen and repair it.