Should you be delusional and don't have a chance in hell, rarely will partners clue you in. That's because they want to squeeze all the good work and excessive hours out of you. So they will not tamper with your delusion, likely including performance reviews (until the final days).
What you have to gain from the belief is that it could really come true. In the remarkable book "Kidding Ourselves: The Hidden Power of Self-Deception," Joseph T. Hallinan presents tons of research on the phenomenon of how belief shapes destiny.
In the jungle, the primitive who believes a spell has been cast on him will die. The woman who believes she is taking a wonder drug will get well even if it's a placebo.
After all, we have all seen the confident associate strutting around, attracting (a la The Secret) thousands of billable hours from partners.
But even if your belief system doesn't result in making partner, along the way you will be joyful. You will make the kinds of professional friends who can open doors for you for what's next.
The most amazing example of this is fictional Lorna Morella. On "Orange Is the New Black," she is delusional about some guy Christopher whom she had stalked before the lockup. That psychosis is the platform on which she builds her life. It's a good life despite her awful one before she was incarcerated.
In the slammer she's popular. Because she is pleased with her (make-believe) life, she can even reach outside herself. As she drives the prison van with newbies she can extend support.
Morella is evolving into the most captivating character in the series. Her way of coping resonates with us. Who hasn't been perfectly content when operating with a delusion? The usual case is the belief that someone loves you as much as you love them. Sure, when the bubble bursts, you will be traumatized for a bit. However, that's a small price for the gift of such a wonderful day to day sense of pleasure.
My late mother was psychotic. Her life was more stable and joy-filled than mine. Day to day I struggled to find and stay in reality. Supposed mental health is way over-rated.