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I have this same issue. I've never seen a chair that supports shoulders back and down good posture. They all seem to hunch or arch forward. None offer the mid back support needed to put your chest forward.

Same situation for sitting cross legged. My solution for posture has been a standing desk. I never really made any progress on my posture until I started standing.

Check out the Haider Bioswing (https://bioswing.de/en/sitzsysteme/produkte/ergonomischer_ch...)

No idea if they are available internationally.

I got one last year and I’d say the architecture definitely forces you to sit straight and relax less than you do with most chairs.

But not necessarily in an uncomfortable way. It’s just not a chair for relaxed gaming or movie watching. That’s what makes it so great when working

Same. For me it's old band habits. Used to sitting on front edge of the chair not using the back rest.