3 years of use from a piece of complex hardware that could keep going easily for 7/8 years.
This kind of narrow planned obsolescence should be an environmental crime.
It's a shame that expensive devices nowadays are made to be disposable. After getting a battery replacement, this phone is ready to go for a few more years at least. SoCs have gotten so good that even a half a decade old chip will perform well for the vast majority of users that don't play big games on their phones. It's not like you need a supercomputer to browse social media, websites and use maps for navigation.
Now, it might be argued that Google has no obligation to produce updates for their products, but... if I try to improve security on the phone by using third-party distributions that are updated, rather than buying a new phone, then thanks to Google's SafetyNet, the phone will be crippled and have difficulty running many banking, payment, and other apps that are at this point a requirement in many situations. Thus, the reason the phone is problematic at this point is because of Google's working to make the phone unusable, not just the lack of updates.
It is bizarre that SafetyNet will vouch for the security of an OS Google itself argues to me is unsafe because of lack of updates, while not allowing a third-party distribution. Yet I suppose I wouldn't be surprised if Google eventually decides to have SafetyNet stop functioning entirely on older devices, in the name of security, to make them even less usable.
https://download.lineageos.org/taimen
That device is officially supported by Lineage and as such gets weekly OTA updates. You'll get a clean Android experience not unlike that of the original Pixel, you can - but don't have to - install Google apps and can even if so required get one of the 'PixelExperience' distributions:
https://download.pixelexperience.org/taimen
Personally I'd stay away from those since they are (by design) heavily tied into the Google world while I do my best to stay free but if you're a heavy Google user this might be the way to go.
But most other Android phones don't have a long support lifetime either. Heck, there are a lot of new phones you can buy today that have outdated OS versions, and you're not likely to get much in the way of updates either.
If they could run Android apps on it with reasonable performance, it would be an easy switch.
I have the 3a and 4a (non-5G), if you can find a 4a someone is trying to give away on the cheap it's basically a nicer version of the 3a IMHO. It's going to EOL in a year so I wouldn't spend much on it, but if one crosses your path for $100, well...