https://www.pcmag.com/how-to/the-3g-shutdown-how-will-it-aff....
Most of that is a chicken-and-egg problem. 3G was dropped because very few phones were still using it, and you could not run 3G on the same frequency as 4G/5G. If phones lasted longer, more people would've remained on 3G, so they would not have dropped it. Furthermore, 4G and 5G can share the same equipment and frequency due to Dynamic Spectrum Sharing, so there is no technical reason to quickly get rid of 4G like we wanted with 2G & 3G.
That being said, Apple is atm way better in providing longterm software updates, but that doesn't mean Google isnt doing a lot of work there also.
Next to that, there is already a lot of apps that are updated through the Play Store instead of an OS update. Mail, Dialer, Android Auto, Photos, Camera, Keyboard, Contacts, Clock, Play services, ...
https://en.m.wikipedia.org/wiki/Android_One
And none of those apps help when there are security vulnerabilities at lower levels.
First 4g devices were released in 2012, in 2014 you could find sub 150€ 4G devices. If you bought the last 3G phone in 2015~ (there were still 3G phones after that, but nothing reasonable), 10 years of network support is still reasonably within reach.
Unless you care about your phone working as a phone. 2G was discontinued years ago, 3G is rapidly being dropped by the carriers and how much longer before 4G is discontinued?
> streamlining the Android update process? (To Google's credit they have already done a _lot_ of positive work in that area as I understand it).
What exactly is Google doing? Apple released a security update for the 2013 iPhone 5s earlier this year.