entangled

That's not correct: the system is entangled across those two registers, and the partial portion of one of those systems is a mixed state.

In their case it is entangled not mixed and so there is no need to take the partial trace.

You can only use your argument by begging the question, and assuming that these entangled issues are easily separated.

For example, missed deals/profit due to one's reduced capacity to work while entangled in a legal mess.

However, entangled states are not of this form, and cannot be treated in this way.

What you really want is a single output, and there's no generic way of disentangling the entangled state in a useful way.

Do humans really generate any information at all that doesn't come from entangled systems?

And it points out where certain parts are too entangled and bound to implementation.

It is possible to compute all outputs in parallel with a quantum computer, but what you'll end up is an unintelligibly entangled state.

After that point, the wagons were circled and any such criticism became subtly entangled with implied support for coercion and violence by the state.

As Wikipedia says, in a quantum computer, you have a quantum register (a bunch of entangled qubits) that holds the result of your computation.

I send one half of my entangled pair to the Moon and I send the other half down a fiberoptic delay line.

I think you don't understand what entangled means; if I take two envelopes and put a 1 in the first and a 0 in the second, the envelopes aren't "entangled".

The marriage "license" in polygamy is between man and women, yet by secondary effects the women are fully entangled with one another.