Untrue, the Zenfone 9 is also getting android 14, that may be it's last major update. Zenf10 should be set for android 15 as well.
Zenf8 is on adroid 13 and got a security update in october, so things are looking decent imho.
Ah that sucks, I started with the zenfone 8 and seeing the market and how much I use my headphone jack, I sincerely hope Asus gets their update act together before I need to upgrade. What did you switch to?