Thanks for the quick reply! I'm really in the same boat as you, as I do not want to create a system where an "identity police" can create eligibility by the length of noses.
When you make that official policy [...] abusing that system will be easy
Are you not seeing that this exists already? There are people claiming to be unemployed, receiving unemployment money, and work without registering their income. That's where I wish people would differentiate more. These problems you listed already exist and must be solved either way! But should we therefore not make attempts to get more talented people into the right careers?
Take everyone's children away from their parents [...] exclude the parents' culture and values and the peer group of children from having influence on their future, that's the way
Why? Why eliminate their environment, instead of - as I proposed - enriching it by providing additional access to opportunities?
But they are the same for all
They are not, that's the point! Only because you can measure income does not make this barrier objective. It was set by humans, who were biased in their decision (hence why the committee which negotiates the Mindestlohn is composed of multiple interest groups). Again, I am not advocating that using lengths of noses is comparable, but stating that "gender and ethnicity don't play a role" is plain wrong. They do not play a role at the time you ask for it, yes, absolutely. But they do play a role in the negotiation phase and in the overall structure of social programs.