In practice, this is relevant once you’ve already bought a chair and want to maximize the comfort you can get from it, balanced against the difference of comfort you could buy & chance of getting that comfort (or some lower value, or some higher) & money you’d need to spend.
When purchasing a new chair, I don’t think this will be an important factor in the overwhelming majority of situations.
In practice, this is relevant once you’ve already bought a chair and want to maximize the comfort you can get from it, balanced against the difference of comfort you could buy & chance of getting that comfort (or some lower value, or some higher) & money you’d need to spend.
When purchasing a new chair, I don’t think this will be an important factor in the overwhelming majority of situations.