I think this is mostly true and there are plenty of qualifiers. Stress is an excellent example. But in general, you can still apply various forms of leverage and get more results.
eg your ability to calculate in your head is usually limited but if you leverage the use of a calculator you can operate faster.
Also you can practice various aspects and become more efficient. So learning a technique for calculating faster can actually make you faster. Or you can memorise the Times Table and just lookup the result rather than calculating it.
The actual exploration of options can be accelerated as well. You need to be able to collapse the complexity of the evaluation down and trust this process being accurate. This is not trivial.
Even the impact of stress can be reduced by changing the "stress floor" level of what you've encountered. You can place yourself in multiple stressful situations and practice to get better.
eg your ability to calculate in your head is usually limited but if you leverage the use of a calculator you can operate faster.
Also you can practice various aspects and become more efficient. So learning a technique for calculating faster can actually make you faster. Or you can memorise the Times Table and just lookup the result rather than calculating it.
The actual exploration of options can be accelerated as well. You need to be able to collapse the complexity of the evaluation down and trust this process being accurate. This is not trivial.
Even the impact of stress can be reduced by changing the "stress floor" level of what you've encountered. You can place yourself in multiple stressful situations and practice to get better.