> Smartphone hardware is done. There's no significant gain in buying a new smartphone if you have bought one in last 3 years, absolutely nothing if the battery is replaced; there could be even diminished returns if you buy a new smartphone(unavailability of headphone jack, losing metal body, losing faster biometric authentication).
That's true in the Android world as well. When the GPS in my three-year-old LG Stylo 2 finally crapped out so thoroughly (along with a puffed-up battery, perhaps with a built-in antenna being damaged?) that I couldn't ignore it anymore, I wound up getting a Stylo 5.
As it turns out, it has the same Qualcomm 450 SoC as the three-year-old phone it replaced. It's fast enough for my needs, but no speed demon. The only real upgrades are support for more of T-Mobile's LTE bands, a higher-resolution screen, an aluminum frame, a 3500 mAh battery up from 3000, and Android 9; the camera app is improved, and the Bluetooth stack is more up-to-date. Much to their credit, they had the courage to not remove the headphone jack. There is one major downgrade: the inevitable sealed-case, non-removable battery schtick that I really hate. I hope that fad passes by the time I need to replace this one, but there's too much money at stake for the phone manufacturers not to shaft their customers. I better hope the battery doesn't crap out prematurely.
That being said, I like the Stylo 5; the 2 had excellent battery life even when the battery got puffy, and the 5 is even better (at least in my first week of usage). That relatively-anemic 450 SoC is at least power-efficient.