Adding on to the racing chairs bad discourse, racing seats are designed first and foremost to keep you alive, rather than comfortable. You aren't supposed to slouch in racing seats because they're built with you using a 6 point harness and HANS in mind, so 8Gs won't move you around. This also prevents you from slouching so they aren't designed to keep you comfortable if you have bad posture.
Adding on to the racing chairs bad discourse, racing seats are designed first and foremost to keep you alive, rather than comfortable. You aren't supposed to slouch in racing seats because they're built with you using a 6 point harness and HANS in mind, so 8Gs won't move you around. This also prevents you from slouching so they aren't designed to keep you comfortable if you have bad posture.