So there isn't any chair like this that can offer good work posture?

for any number of reasons

If you have time, what are these reasons?

Edit : found an other one (still not available in Europe)

https://www.amazon.com/Efomao-Leather-Computer-Managerial-Executive/dp/B0B12B2S9X/ref=sr_1_30?keywords=High%2BBack%2BTilt%2BLock%2BComputer%2BChairs&qid=1682973950&sr=8-30&th=1

So apparently that's kind of a thing? Are you sure there is no good support with these chair?