I've found that it's possible to very cleanly separate pessimism and optimism while still experiencing both. When I'm with my family or ideating on a new project, optimism is a much better mindset as it allows the mind to wander, create and relax.
When I am in the depths of a project where I have a lot of things that I need to fail at to understand, a negative mindset is more useful.
Maintaining a positive mindset in the face of a multitude of assured failures is possible, but draining. However, a negative mindset, is more engine-like and muddles along, unsurprised by the failures.
Again, this is a purely personal anecdote and I would not recommend adopting a negative mindset to other people.
When I am in the depths of a project where I have a lot of things that I need to fail at to understand, a negative mindset is more useful.
Maintaining a positive mindset in the face of a multitude of assured failures is possible, but draining. However, a negative mindset, is more engine-like and muddles along, unsurprised by the failures.
Again, this is a purely personal anecdote and I would not recommend adopting a negative mindset to other people.