No jack? Send it back.
Genuinely question. If you want something with a modern high performance processor what options do you have that also include a jack?

I think Sony Xperia phones.

m.gsmarena.com/sony_xperia_1_vii_5g-13843.php

Snapdragon 8 Elite. Release May 13, 2025.

Sony Xperia 1 VII - Full phone specifications

Sony Xperia 1 VII 5G Android smartphone. Announced May 2025. Features 6.5″ display, Snapdragon 8 Elite chipset, 5000 mAh battery, 512 GB storage, 12 GB RAM, Corning Gorilla Glass Victus 2.

How can we convince Sony to open the platform for third party os’s cuz I’m not buying something with slacking security updates in this age
I think they’re pretty open? Atleast I’ve seen a few good custom roms for Sony Phones, like DivestOS (before it died). I don’t know if they stopped doing that recently.
Makes little difference now since Xperia abandoned the US entirely – but the last few years they were in the US, Xperia US devices were locked down.