> The problem with long term support for my Android phones has actually not been the fact that Android devices have incredibly short security update windows. That issue has been somewhat mitigated with the newer Google Pixel phones which have five years of security updates.

The problem with long term support for Android devices is absolutely short security update windows, i.e. short term support for Android devices. Pixel comprises a tiny fraction of Android devices sold in the US, and a miniscule fraction worldwide.