I can understand your concerns. Capitalism does indeed treat ordinary workers cruelly and callously, only showing interest in them as tools to help make profits for greedy rich people, and not as living, feeling people with needs and dreams. This is an awful, unjust way of doing things.
However, I'm not sure if it's really fair to suggest such treatment in this game. Qmin gets rated by her customer, Chloe, based on what Chloe personally felt about Qmin's service. What you have to remember about Chloe is that she is quite shy and nervous and inexperienced when it comes to sexual matters. So, Qmin has to be careful to put her at ease and make her feel comfortable, otherwise Chloe won't get what she wants out of the session. It's understandable that Qmin talking about sad parts of her life would make Chloe uneasy, because people generally feel bad when people talk to them about bad things that happen in their life. Also, that sort of talk might make Chloe doubt Qmin's professionalism, and make her feel less confident about Qmin's advice.
I don't think this is a case of 'This sex advice worker expressed personal feelings and vulnerabilities! Workers aren't supposed to act like real people, they're only supposed to be mindless, efficient machines to make money!' I think it's more a case of 'This sex advice worker acted too casually and thoughtlessly, and didn't consider her client's feelings enough, and that meant that the client didn't get as much out of the session as she could have.'
When a client is recieving some kind of service, I don't think it's unreasonable for that client to expect some level of professionalism, or some level of cheerfulness, if that's what would make the client feel at ease. Even in a fairer, kinder, non-capitalist system, I expect people recieving this kind of service would still want to be treated like that.
Of course, this could also be because Qmin only serves ONE client in this game. If she served several different clients, with different needs and different personalities, then maybe they woud rate her differently - maybe they would like it if she was more jokey or expressed more of her vulnerabilities.