Why does stress show individually, if it is not the individual's problem?

Why does stress show individually, if it is not the individual's problem?

Strees is both an overload of the individual's self-management, but also a motor for a more productive self-management. Why?

Because at todays' workplaces where self-managemetn becomes more and more common, stress functions as a border for personal productivity.

We can perform, but only to the limit where stress begins to take over.

But when we reach the stress-limit, what is the typical strategy for us as employees and managers?

We optimize our performance with a more effective self-management to maintain production without becoming stressed out.

This is the paradox that makes stress show individually.

But does it also mean that stress is the self-management problem of the individual?