A friend wants to degoogle his phone, so I suggested the OS I'm currently using. The one we can't talk about... He wants a small/compact phone, so I suggested pixel 4a (not buying second hand though), but I'm afraid that planned obsolescence may kill the phone rather soon. What's your opinion?
Pixel 5 is end-of-life and shouldn't be used anymore due to lack of security patches for firmware and drivers.
I understand if your friend is on a budget and simply can't afford a non EOL phone but, they should really consider a 6th gen Pixel or better if they care at all about their data security.
I am not sure if there is an example of that specific situation as it would be pretty odd for a phone to be receiving security patches but not firmware updates.
Anyway its not super relevant as the Pixel 5 does not receive firmware or security patches anymore.
OP also seems to be inferring he suggested to his friend to use a very specific security / privacy OS that does not recommend using that model phone anymore for the exact reasons I mentioned. Plus the model is only receiving partial support as a stop gap for users to have time to get a newer model and won't be supported much longer anyway.
Custom ROMs will receive upstream Android security patches but not patches from proprietary components (firmware). For instance, my Moto g7 power has Android security patches from May but the latest vendor security patch level is 2021. (I'm running Lineage OS) I'm curious to know if the older firmware is a problem. I don't think it is easily exploitable outside of government backdoors. Not that it matters much as I plan on keeping my phone until it dies.
There are tons of examples of exploits being used to target EOL phones as its common for people to not care about these updates, or be misinformed, so they are easy targets.
You are still missing my point. All phones actively supported by Lineage OS get Android security patches. Those aren't vendor patches but they do patch the OS and sometimes the kernel.
Not to say that you should still buy it. However, if it cheap it might be worth it.
Also from the article you linked:
Although the incident forced LineageOS to take offline all its service, it did not impact the signing keys that authenticate distributions because they are stored on hosts separate from the main infrastructure.
Lmao putting facts in quotes does not makes them less true. Figures, that when confronted with reality you would immediately start relying on logical fallacies.
Just because you are more at risk of being compromised does not mean you will be compromised. This is obvious.
You don't have to respond if your just going to be a child about it.