Does anyone ever reach a high level of productivity with correct posture? I can't.
[1] https://www.hermanmiller.com/en_gb/products/seating/office-c...
Fortunately, I type this, sitting in my wonderful 15 year old Embody chair so I don't actually need to buy now. Everyone is different and I never raved much about Aerons but the Embody has been very good to me, whether my posture is textbook "good" or "badly" slouched and reclined ... it supports and makes me want to sit and work. :-)
Nice back you've got there. It'd be a shame if anything happened to it.