I consider that state of the art and brand new. I just inherited an iPhone XS and the battery is at 91%. I figure I can go at least another 3 years. For reference I was using a Oneplus 3T which is still going strong.
I have that same phone and have been using it now for six years, and according to the battery health in the settings, the battery is still in good shape, there’s no notice of it being degraded.
I used the same OnePlus 3T that I bought used, until it was stolen. Would have probably considered a new OnePlus but all their models were too big and expensive at the time, so went Pixel 7 near the end of the cycle. Even though I've been a mac user for about 12 years, iPhones have never made it into the realm of consideration.
It is indeed the most comfortable of the phones in the last decade perhaps. I am still rocking it. Recently my battery died and they replaced it but that battery too wouldn’t charge for hours and then would charge by a trickle. They said they’d just replace my phone so now I have a brand new XS max ready for another 5 years.